Brent@GMATPrepNow posted a reply to x is the product of all even numbers from 2 to 50, inclusive in the Problem Solving forum
“x = (2)(4)(6)....(46)(48)(50) = (1)(2)(2)(2)(3)(2).....(23)(2)(24)(2)(25)(2) Notice that: x is divisible by 2. This tells us that x+1 is 1 greater than a multiple of 2. In other words, x+1 is NOT divisible by 2 x is divisible by 3. This tells us that x+1 is 1 greater than a multiple of 3. ...”
Today
Rich.C@EMPOWERgmat.com posted a reply to x is the product of all even numbers from 2 to 50, inclusive in the Problem Solving forum
“Hi All, We''re told that X is the product of all even numbers from 2 to 50, inclusive. We''re asked to define what the smallest prime factor of (X+1) must be. This particular question is a variation on an Official question that periodically pops up in the forums. The main idea behind this prompt ...”
Today
Brent@GMATPrepNow posted a reply to If there are 4 pairs of twins, and a committee will be in the Problem Solving forum
“Here''s one approach. Take the task of selecting the 3 committee members and break it into stages. Stage 1: Select the 3 twins from which we will select 1 spouse each. There are 4 sets of twins, and we must select 3 of them. Since the order in which we select the 3 twins does not matter, ...”
Today
Brent@GMATPrepNow posted a reply to If arc PQR above is a semicircle, what is the length of diam in the Data Sufficiency forum
“http://s16.postimg.cc/p2mwbwdpt/triangle_PQR.jpg We can answer this question without performing any calculations. Instead, we can use some visualization. Important point: For geometry DS questions, we are typically checking to see whether the statements "lock" a particular angle or ...”
Today
Rich.C@EMPOWERgmat.com posted a reply to A furniture store sells only two models of desks, model A in the Problem Solving forum
“Hi All, We''re told that a furniture store sells only two models of desks, model A and model B. The selling price of model A is $120, which is 30 percent of the selling price of the model B - and the furniture store sells 2,000 desks, 3/4 of which are model B. We''re asked for the TOTAL revenue ...” Today Brent@GMATPrepNow posted a reply to In a group of children, the average (arithmetic mean) weight in the Problem Solving forum “We can also use weighted averages to solve this Weighted average of groups combined = (group A proportion)(group A average) + (group B proportion)(group B average) + (group C proportion)(group C average) + ... Let G = number of girls Let B = number of boys So, G+B = TOTAL number of children ...” Today Rich.C@EMPOWERgmat.com posted a reply to Point A in the xy-coordinate system is shown below. Given in the Problem Solving forum “Hi All, We''re told that Point A is in the xy-coordinate system as shown - and that two other points B (4a, b) and C (2a, 5b) are also in the system. We''re asked for the AREA of triangle ABC in terms of a and b. This question can be approached in a couple of different ways, including by TESTing ...” Today Rich.C@EMPOWERgmat.com posted a reply to In a group of children, the average (arithmetic mean) weight in the Problem Solving forum “Hi All, We''re told that in a group of children, the average (arithmetic mean) weight of the boys is 60 pounds, the average weight of the girls is 48 pounds and the average weight of ALL of the children in the group is 50 pounds. We''re asked for the ratio of the number of boys to the number of ...” Today Brent@GMATPrepNow posted a reply to If the average (arithmetic mean) of five consecutive negativ in the Problem Solving forum “Let x = the 1st (smallest integer) So, x+1 = the 2nd integer x+2 = the 3rd integer x+3 = the 4th integer x+4 = the 5th integer (greatest integer) What is the difference between the greatest and least of the five integers? Difference = ( x+4) - x = 4 Answer: A Cheers, Brent” Yesterday Brent@GMATPrepNow posted a reply to The number 1000 lies between two consecutive perfect squares in the Problem Solving forum “Let''s examine some perfect squares that are close to 1000 30² = 900 31² = 961 32² = 1024 So, 1000 lies between 961 (aka 31²) and 1024 (aka 32²) 1000 is closer to 1024 (aka 32²) than to 961 Answer: D Cheers, Brent” Yesterday Brent@GMATPrepNow posted a reply to Danny spends$360 buying his favorite dolls. If he buy only in the Problem Solving forum
“Let L = cost of 1 LARGE LemonHead doll So L-1 = cost of 1 SMALL LemonHead doll If he buys only small LemonHead dolls, which are $1 cheaper than the large LemonHead dolls, he could buy 5 more dolls than if he were to buy only large LemonHead dolls. Let''s first write a "word equation": ...” March 18, 2019 Jay@ManhattanReview posted a reply to An insurance company has a contract with a medical in the Data Sufficiency forum “Let''s take each statement one by one. 1) The insurance company is required to pay only 20 percent of the original bill for the test. Since the company pays 20% of the bill, the discount percent = 80%. Sufficient. 2) The insurance company is required to pay$46 for the test. Percent ...”
March 18, 2019
Jay@ManhattanReview posted a reply to At a graduation ceremony, some students earned bachelors in in the Data Sufficiency forum
“Say, The number of students who earned bachelors degree only in science = s; The number of students who earned bachelors degree only in arts a; The number of students who earned bachelors degree only in science and art both = b Thus, we have s + b + a = 200. We have to get the value of s ...”
March 18, 2019
Jay@ManhattanReview posted a reply to In the figure above, if x and y are each less than 90 and PS in the Data Sufficiency forum
“This can be solved with little imagination. Let''s take each statement one by one. 1) $$x > y$$ => $$90 > x > y$$ Imagine x = 75 and y = 30; you would observe that PQ << SR. Even if x and y are close to each other, ensuring that x > y, we have PQ < SR. The answer ...”
March 18, 2019
Brent@GMATPrepNow posted a reply to Bea owns how many more CDs than Al owns? (1) If Bea gives 9 in the Data Sufficiency forum
“Let A = number of CDs Al owns Let B = number of CDs Bea owns Target question: What is the value of B - A? Statement 1: If Bea gives 9 of her CDs to Al, then Al will own twice as many CDs as Bea owns. We can create the equation: 2(B - 9) = A+9 Expand left side to get 2B - 18 = A+9 ...”
March 16, 2019
Brent@GMATPrepNow posted a reply to How many different 3-digit numbers are greater than 299 and in the Problem Solving forum
“Take the task of creating the 3-digit numbers and break it into stages. Stage 1: Select the first digit (hundreds digit) Since the first digit can be 3, 4, 5, 7 or 9, we can complete stage 1 in 5 ways Stage 2: Select the second digit (tens digit) Since the second digit can be 0, 2, 3, 4, ...”
March 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to A certain hotel has 1,400 single rooms and 420 double rooms. in the Problem Solving forum
“Hi camitava, This is essentially a rate question. Here''s how to solve it: Single rooms take one person 15 minutes to clean and double rooms take one person 20 minutes to clean. 15 mins. = 1/4 hour 20 mins. = 1/3 hour With 1400 single rooms x 1/4 hour = 350 hours of total work for ...”
March 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to A cosmetics company would like to market a six-item gift in the Problem Solving forum
“Hi All, We''re told that a cosmetics company would like to market a 6-item gift basket bundle from a set of 10 possible items, but 49 of the potential bundles have already been eliminated from consideration. We''re asked for the total number of potential bundles that are still being considered. ...”
March 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to What is the sum of the integers from 1 to 999, inclusive? A in the Problem Solving forum
“Hi All, We''re asked for the sum of the integers from 1 to 999, inclusive. This question can be approached in a number of different ways, including by "bunching" The sum of 1 and 999 is 1,000 The sum of 2 and 998 is 1,000 The sum of 3 and 997 is 1,000 Etc. Using the numbers ...”
March 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to A basketball team’s current roster consists of g guards an in the Problem Solving forum
“Hi All, We''re told that a basketball team’s current roster consists of G guards and F forwards - and 2 guards join and 1 forward leaves. We''re asked for the probability that a player chosen at random is a guard. This question can be approached in a couple of different ways, including by ...”
March 15, 2019
Brent@GMATPrepNow posted a reply to The cost of delivery for an order of desk chairs was $10.00 in the Data Sufficiency forum “Target question: Is n > 24? Given: The cost of delivery for an order of desk chairs was$10.00 for the 1st chair, and $1 for each additional chair in the order. The office manager placed an order for n desk chairs. Statement 1: The delivery cost for the order totaled more than$30.00 ...”
March 15, 2019
Brent@GMATPrepNow posted a reply to What is the average (arithmetic mean) of eleven consecutive in the Data Sufficiency forum
“There''s a nice rule that says, "In a set where the numbers are equally spaced, the mean will equal the median." Since the consecutive integers are equally-spaced, their mean and median will be equal. Target question: What is the average of eleven consecutive integers? ...”
March 15, 2019
Jay@ManhattanReview posted a reply to In the given figure $$BD=6$$ and $$DC=4$$. If angle $$BAD$$ in the Problem Solving forum
“Given /_ADC = 120, we have /_ADB = 180 – 120 = 60. Again, given /_BAD = 30 and /_ADB = 60, we have /_ABD = 90. Thus, ∆ABD is a 30-60-90 rightangled triangle. For the 30-60-90 the rightangled triangle ∆ABD, given that BD = 6, we have AB = 6√3 Thus, area of ∆ADC = 1/2 * AB * DC = ...”
March 15, 2019
Jay@ManhattanReview posted a reply to The number $$A$$ can be expressed as $$p*q$$ where $$p$$ and in the Data Sufficiency forum
“We have A = pq. We need to determine whether A is divisible by 16; for it to happen pq must be divisible by 16. Let''s take each statement one by one. 1. $$p=8*k$$, where $$k$$ is an odd number. pq = 8kq If q is even, the answer is yes; however, if q is odd, the answer is no. ...”
March 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to After multiplying a positive integer A, which has n digits, in the Problem Solving forum
“Hi Gmat_mission, We''re told that after multiplying a positive integer A (which has N digits) by (N+2), we get a number with (N+1) digits, all of whose DIGITS are (N+1). We''re asked for the number of possible values of A that ''fit'' this description. To start, this question certainly ...”
March 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to At a certain supplier, a machine of type A costs $20,000 and in the Problem Solving forum “Hi All, This question is really just about basic arithmetic and staying organized. Based on the information in the prompt, there are two ''total costs'' that we have to calculate... Total cost of purchasing 2 Type A machines = Base Price = (2)($20,000) = $40,000 The 20% down payment = ...” March 15, 2019 Rich.C@EMPOWERgmat.com posted a reply to In an office of eleven people, everyone but Lauren each in the Problem Solving forum “Hi All, We''re told that in an office of 11 people, everyone but Lauren each contributed D dollars to buy her a surprise gift for her birthday, but the gift cost a total of G dollars, which was an amount that was less than the total collected. We''re asked - if each member who donated is to ...” March 15, 2019 Brent@GMATPrepNow posted a reply to If 320 people attended the wedding and 200 attendees drank in the Data Sufficiency forum “This question is somewhat ambiguous, since it''s hard to say whether "nondrinkers" in statement 1 refers to people who drank neither beer nor wine, or did not drink beer. I''m assuming that it means to not drink beer, so I''ve add that to the question below. One approach is to use ...” March 14, 2019 Brent@GMATPrepNow posted a reply to Set X consists of different positive numbers arranged in in the Data Sufficiency forum “Target question: What is the arithmetic mean of set X? Given: Set X consists of different positive numbers arranged in ascending order: K, L, M, 5, 7. K, L and M are consecutive integers This means that EITHER K, L, M = 1, 2, 3 respectively, OR K, L, M = 2, 3, 4 respectively Head straight ...” March 14, 2019 Jay@ManhattanReview posted a reply to Ashley and Vinnie work on a sales staff with 8 other in the Problem Solving forum “Including Ashley and Vinnie, there are 10 salespeople. Number of ways of choosing ANY 5 members out of 10 = 10C5; Number of ways of choosing 5 members out of 10 such that 2 of them are Ashley and Vinnie = 2C2 * 8C3 = 8C3; Probability that both Ashley and Vinnie will be chosen = 8C3 / 10C5 = ...” March 14, 2019 Jay@ManhattanReview posted a reply to On Tuesday, Kramer purchases exactly 3 new shirts, 2 new swe in the Problem Solving forum “So, Kramer will start wearing outfits, starting Wednesday and this will go on. We have to find out the day when it is not possible for him to wear a new combination of shirt, sweater, and hat. He has exactly 3 new shirts, 2 new sweaters, and 4 new hats; thus, the total number of combinations ...” March 14, 2019 Jay@ManhattanReview posted a reply to Working at their respective constant rates, Paul, Abdul and in the Problem Solving forum “Work done by Paul, Abdul, and Adam alone in one hour = 1/3, 1/4 and 1/5, respectively. Work done by Paul, Abdul, and Adam together in one hour = 1/3 + 1/4 + 1/5 = 47/60 Fraction of the work will be done by Adam = Part of the work done by Adam / Part of the work done by Adam Paul, Abdul, and ...” March 14, 2019 Brent@GMATPrepNow posted a reply to combinations in the Problem Solving forum “Sure thing. Number of outcomes that OBEY the restriction = (total # of outcomes that IGNORE the restriction) - (# of outcomes that BREAK the restriction) total # of outcomes that IGNORE the restriction Select any 3 people from the 8 people We can do this in 8C3 ways (= 56 ways) # of ...” March 13, 2019 Brent@GMATPrepNow posted a reply to If when x is divided by z, the result is y remainder q, then in the Problem Solving forum “When it comes to remainders, there''s a nice rule that says, "If N divided by D equals Q with remainder R, then N = DQ + R" For example, since 17 divided by 5 equals 3 with remainder 2, then we can write 17 = (5)(3) + 2 Likewise, since 53 divided by 10 equals 5 with remainder 3, then we ...” March 13, 2019 Brent@GMATPrepNow posted a reply to If$5,000 invested for one year at p percent simple annual i in the Data Sufficiency forum
“The great thing about DS questions is that we aren''t required to perform calculations if we know that we COULD perform those calculations. Here''s what I mean: Target question: What amount must be invested at k percent simple annual interest for one year to yield the same amount of dollars ? ...”
March 13, 2019
Brent@GMATPrepNow posted a reply to If xyz ≠ 0, is x^3y^4z^5 > 0? in the Data Sufficiency forum
“ Given: xyz ≠ 0 Target question: Is x³y⁴z⁵ > 0? This is a great candidate for rephrasing the target question. Since we know that x² must be POSITIVE, we can safely take the inequality x³y⁴z⁵ > 0 and divide both sides by x² to get: xy⁴z⁵ > 0 Similarly, since ...”
March 13, 2019
Brent@GMATPrepNow posted a reply to Set M is composed of the positive even integers up to 100. in the Problem Solving forum
“Set M is composed of the positive even integers up to 100. Set M = {2, 4, 6, 8, . . . . 96, 98, 100} Set N is composed of the odd integers from –1 to 99 Set N = {-1, 1, 3, 5, . . . 95, 97, 99} What is the value of (the sum of Set M) – (the sum of Set N)? SUM of set M = 2 + 4 + 6 + 8 + ...”
March 13, 2019
Brent@GMATPrepNow posted a reply to A certain ball was dropped from a window 8 meters above a in the Problem Solving forum
“Drop 8 meters Rise 4 meters Drop 4 meters Rise 2 meters Drop 2 meters Rise 1 meters (DONE!) 8 + 4 + 4 + 2 + 2 + 1 = 21 meters Answer: A Cheers, Brent”
March 13, 2019
Brent@GMATPrepNow posted a reply to A certain hotel has 1,400 single rooms and 420 double rooms. in the Problem Solving forum
“The hotel has 1,400 single rooms, and one person can clean a single room every 15 minutes So, one person can clean 4 single rooms in ONE HOUR In other words, it takes 1 WORKER HOUR to clean 4 single rooms 1400/4 = 350 So, it takes 350 WORKER HOURS to clean 1400 rooms The hotel has 420 ...”
March 13, 2019
Brent@GMATPrepNow posted a reply to The number of candidates rejected in a certain admission pro in the Problem Solving forum
“The number of candidates rejected in a certain admission process was four times GREATER than the number of candidates accepted. Let x = the number of candidates accepted So, x + 4x = the number of candidates rejected In other words, 5x = the number of candidates rejected So, 6x = TOTAL number ...”
March 13, 2019
Jay@ManhattanReview posted a reply to Peter and Tom shared the driving on a certain trip. If Peter in the Problem Solving forum
“Given that Peter only drove 2/5 of the total distance, Tom must drove 1 – 2/5 = 3/5 of the total distance. Since time is same, the ratio of Peter''s average speed to Tom''s average speed = Ratio of their distances = (2/5) : (3/5) = 2 : 3 The correct answer: E Hope this helps! -Jay ...”
March 13, 2019
Jay@ManhattanReview posted a reply to A basketball team’s current roster consists of g guards an in the Problem Solving forum
“The number of guards now = g + 2 and the number of forwards now = f – 1 Total number of players = g + 2 + f – 1 = g + f +1 The probability that a player chosen at random is a guard = number of guards / total number of players = (g + 2) / (g + f +1) The correct answer: D Hope this ...”
March 13, 2019
Jay@ManhattanReview posted a reply to If when x is divided by z, the result is y remainder q, then in the Problem Solving forum
“Let''s take this question as: when 13 is divided by 3, the result is 4 and the remainder is 1. Thus, 13 = 3*4 + 1 Coming to the question: x = yz + q There is no option as x = yz + q. Dividing by z, we get x/z = y + q/z => x/z – y = q/z The correct answer: B Hope this helps! ...”
March 13, 2019
Rich.C@EMPOWERgmat.com posted a reply to A student worked 20 days. For each of the amount shown in th in the Problem Solving forum
“Hi All, We''re told that a student worked 20 days - and the given table shows the number of days that the student earned each of 5 possible amounts of money. We''re asked for the MEDIAN amount of money earned per day for those 20 days. Since there are 20 total days, the MEDIAN will be the ...”
March 12, 2019
Rich.C@EMPOWERgmat.com posted a reply to In a group of 24 musicians, some are pianists and the rest a in the Problem Solving forum
“Hi All, We''re told that in a group of 24 musicians, some are pianists and the rest are violinists and exactly 1/2 of the pianists and exactly 2/3 of the violinists belong to a union. We''re asked for the LEAST possible number of union members in the group. This question can be approached in a ...”
March 12, 2019
Brent@GMATPrepNow posted a reply to In a group of 24 musicians, some are pianists and the rest a in the Problem Solving forum
“In a group of 24 musicians, some are pianists and the rest are violinists. Let x = number of pianists So, 24-x = number of violinists Exactly 1/2 of the pianists and exactly 2/3 of the violinists belong to a union. So, the number of pianists in the union = x/2 And the number of violinists in ...”
March 12, 2019
Jay@ManhattanReview posted a reply to In each of the last five years, Company K donated p percent in the Data Sufficiency forum
“Let''s take each statement one by one. We have to determine whether p% of last year''s annual profit > 100,000. (1) Two years ago, Company K had annual profits of $3 million and donated$15,000 to the scholarship fund. Certainly insufficient since the data is for the last year. ...”
March 12, 2019
Rich.C@EMPOWERgmat.com posted a reply to If a certain reel of film runs at 5/6 of a frame per second, in the Problem Solving forum
“Hi All, We''re told that a certain reel of film runs at 5/6 of a frame per second. We''re asked how long it will take to run 2580 frames of the film. While this question involves some ''ugly'' numbers, the answer choices are sufficiently ''spread out'' that you can use estimation to get the ...”
March 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to Five friends play blackjack in Las Vegas and lose an average in the Problem Solving forum
“Hi All, We''re told that 5 friends play blackjack in Las Vegas and lose an AVERAGE of $100 each - with the losses of two of the friends totaling$380. We''re asked for the AVERAGE loss of the other 3 friends. This question is a standard Average Formula question and requires just a bit or ...”
March 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to The R students in a class agree to contribute equally to buy in the Problem Solving forum
“Hi All, While this question is wordy, and will require some note-taking, it can be solved by TESTing VALUES. Let''s TEST... R = 5 students Y = 50 dollars X = 3 fail to pay So the ''story'' is that 5 students agree to pay an equal amount for a $50 present (that''s$10 per student). We''re ...”
March 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to A city council will select 2 of 9 available firefighters and in the Problem Solving forum
“Hi All, We''re told that a city council will select 2 of 9 available firefighters and 1 of 6 available police officers to serve on an advisory panel. We''re asked for the number of different groups of 3 people that could serve on the panel. This question is essentially a Combination Formula ...”
March 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to Ramon wants to cut a rectangular board into identical square in the Problem Solving forum
“Hi All, We''re asked to find the minimum number of identical SQUARES that be cut from an 18 in. x 30 in. board without ''wasting'' any of the space. To accomplish this, we need to find a square whose dimensions will evenly divide into both 18 and 30; to find the LEAST number of squares, we''ll ...”
March 11, 2019
Brent@GMATPrepNow posted a reply to Carmen currently works 30 hours per week at her part-time jo in the Data Sufficiency forum
“ Given: Carmen currently works 30 hours per week Target question: If Carmen''s gross hourly wage were to increase by $1.50, how many fewer hours could she work per week and still earn the same gross weekly pay as before the increase? This is a good candidate for rephrasing the target ...” March 11, 2019 Brent@GMATPrepNow posted a reply to W, X, Y and Z are four different positive integers. When X in the Problem Solving forum “ Given: When X is divided by Y, the quotient is Z and the remainder is W. ------ASIDE------- There''s a nice rule that says, "If N divided by D equals Q with remainder R, then N = DQ + R" For example, since 17 divided by 5 equals 3 with remainder 2, then we can write 17 = (5)(3) + 2 ...” March 11, 2019 Jay@ManhattanReview posted a reply to If 3x + 12 = 21, then x + 4 = in the Problem Solving forum “We have 3x + 12 = 21 Takin 3 as common, we have 3(x + 4) = 21 => x + 4 = 21/3 = 7. The correct answer: D Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes London | GMAT Prep Courses Shanghai | LSAT Prep Courses Boston | SAT Prep Classes ...” March 11, 2019 Jay@ManhattanReview posted a reply to Carmen currently works 30 hours per week at her part-time jo in the Data Sufficiency forum “Say Carmen currently earns$x per hour; thus, she earns $30x per week. Now her per hour wage increased to$(x + 1.50). Thus, to earn the same gross weekly wages, she must work 30x / (x + 1.50) hours. We have to get the value of x. Let''s take each statement one by one. (1) Her gross weekly ...”
March 11, 2019
Jay@ManhattanReview posted a reply to A farmer who grows strawberries defines a "workday yiel in the Data Sufficiency forum
“The volume of the entire expected crop of strawberries = Workday yield * Number of calendar days * Number of workers Let''s take each statement one by one. (1) A workday yield is 45 liters. We do not know ''the volume of the entire expected crop of strawberries,'' can''t get the value of ...”
March 11, 2019
Jay@ManhattanReview posted a reply to What is the LCM of the numbers 3, a, and 7, if ‘a’ is an in the Data Sufficiency forum
“Let''s take each statement one by one. Statement 1. ‘a’ is a prime number greater than 2. Case 1: Say a = 3, then the LCM of the numbers 3, a = 3, and 7 = 21. Case 2: Say a = 5, then the LCM of the numbers 3, a = 5, and 7 = 105. No unique answer. Insufficient. Statement 2. Both GCD ...”
March 11, 2019
Brent@GMATPrepNow posted a reply to What is the hundredths digit of the decimal z? in the Data Sufficiency forum
“Target question: What is the hundredths digit of the decimal z? Statement 1: The tenths digit of 100z is 2 Notice what happens when we take a decimal like 0.123456 and multiply it by 100. We get 12.345 (the tenths digit is 3) In the original decimal, the 3 was in the thousandths place. ...”
March 10, 2019
Brent@GMATPrepNow posted a new topic called W, X, Y and Z are four different positive integers. When X in the Problem Solving forum
“W, X, Y and Z are four different positive integers. When X is divided by Y, the quotient is Z and the remainder is W. If W = X – 7, what is the sum of all possible values of W? A) 19 B) 20 C) 21 D) 22 E) 23 Source: www.gmatprepnow.com Difficulty level: 650 - 700”
March 10, 2019
Brent@GMATPrepNow posted a reply to If 4x − 3y = 13 and 5x + 2y = − 1, then x = in the Problem Solving forum
“GIVEN: 4x − 3y = 13 5x + 2y = − 1 Take the TOP equation and multiply both sides by 2 Take the BOTTOM equation and multiply both sides by 3 We get: 8x - 6y = 26 15x + 6y = -3 ADD the two equations to get: 23x = 23 Solve: x = 23/23 = 1 Answer: C Cheers, Brent”
March 10, 2019
Brent@GMATPrepNow posted a reply to W, X, Y and Z are four different positive integers. in the Data Sufficiency forum
“Target question: What is the value of Z? Given: When X is divided by Y, the quotient is Z and the remainder is W. ------ASIDE------- There''s a nice rule that says, "If N divided by D equals Q with remainder R, then N = DQ + R" For example, since 17 divided by 5 equals 3 with ...”
March 8, 2019
Brent@GMATPrepNow posted a reply to OG 2017 Ratio Question in the Data Sufficiency forum
“Target question: What is the total number of articles of clothing in the closet? Given: The ratio of the number of shirts to the number of dresses to the number of jackets in the closet is 9:4:5, respectively. If shirts : dresses : jackets = 9 : 4 : 5, then there are infinitely many ...”
March 7, 2019
Brent@GMATPrepNow posted a new topic called W, X, Y and Z are four different positive integers. in the Data Sufficiency forum
“W, X, Y and Z are four different positive integers. When X is divided by Y, the quotient is Z and the remainder is W. What is the value of Z? 1) W = X – 4 2) W + Z = 4 Difficulty level: 650 – 700 Source: www.gmatprepnow.com”
March 7, 2019
Brent@GMATPrepNow posted a reply to 60 DAY STUDY GUIDE ENQUIRY in the Ask a GMAT Prep Now representative forum
“Sorry, but there are no plans to update the 60-day guide in the near future. Cheers, Brent”
March 7, 2019
Jay@ManhattanReview posted a reply to At a particular moment, a restaurant has x biscuits and y pa in the Data Sufficiency forum
“So, in a nutshell, we have to find out the possible values of x/y such that x/y is an integer, x > 2 and y > 1. Let''s take each statement one by one. (1) x = a^2*b^3, where a and b are different prime numbers Given that x = a^2*b^3, the number of factors of x are (2 + 1)*(3 + 1) = ...”
March 7, 2019
Jay@ManhattanReview posted a reply to Of the 12 temporary employees in a certain company, 4 will in the Problem Solving forum
“So, there are 5 women and 7 men; out of 5 women, 3 are to be chosen and out of 7 men, 1 is to be chosen. # of possible groups of 4 employees consist of 3 women and one man = 5C3 * 7C1 = (D Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Vienna ...”
March 7, 2019
Jay@ManhattanReview posted a reply to A right circular cylinder with a radius of 2 feet and a leng in the Problem Solving forum
“Given that the height of the cylinder is 6, the height of each of the three pieces = 6/3 = 2 feet Thus, the volume of each of the three pieces = πr^2*h = π*2^2*2 = 8π feet^3 The correct answer: C Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT ...”
March 7, 2019
Brent@GMATPrepNow posted a reply to What is the sum of all of the integers in the chart above? in the Problem Solving forum
“Always check the answer choices BEFORE solving the question!! Since the answer choices are nicely spread apart, we can be quite aggressive in our estimation Let''s add the 5 numbers in each COLUMN COLUMN 1: Sum ≈500 COLUMN 2: Sum ≈-1000 COLUMN 3: Sum ≈1500 COLUMN 4: Sum ≈-2000 ...”
March 6, 2019
Brent@GMATPrepNow posted a reply to If 0.02 < x < 0.04 and 100 < y < 250, which of t in the Problem Solving forum
“We can use a nice (and often tested) fraction property that says: (a - b)/c = a/c - bc So, (y-x)/(xy) = y/xy - x/xy = 1/x - 1/y That''s better! So, we''re now looking for a possible value of 1/x - 1/y Let''s look at some EXTREME values. We can MAXIMIZE the value of 1/x - 1/y by MAXIMIZING ...”
March 6, 2019
Brent@GMATPrepNow posted a reply to For every even positive integer m, f(m) represents the in the Problem Solving forum
“f(24) = 2 x 4 x 6 x 8 x 10 x 12 x 14 x 16 x 18 x 20 x 22 x 24 Rewrite as prime factorization: f(24) = 2 x (2)(2) x (2)(3) x (2)(2)(2) x (2)(5) x (2)(2)(3) x (2)(7) x (2)(2)(2)(2) x (2)(3)(3) x (2)(2)(5) x (2)(11) x (2)(2)(2)(3) Answer: E ASIDE: As you can see from the answer choice, I ...”
March 6, 2019
Jay@ManhattanReview posted a reply to To install cable television in a home, a certain cable compa in the Data Sufficiency forum
“Say the Horace family for installed x numbers of cable television in their home. Thus, we have the company would charge them = $(30 + 20x) We have to determine the value of$(30 + 20x). Let''s take each statement one by one. (1) The cable company installed three cable outlets in the ...”
March 6, 2019
Jay@ManhattanReview posted a reply to If Carmen had 12 more tapes, she would have twice as many in the Data Sufficiency forum
“Say Carmen has C number of tapes and Rafael has R number of tapes. Thus, from the given condition, we have C + 12 = 2R We have to determine whether C < R. Let''s take each statement one by one. (1) Rafael has more than 5 tapes. Case 1: Say R = 6 (Minimum possible value of R) ...”
March 6, 2019
Jay@ManhattanReview posted a reply to Each of the items in a box is either a ball or a cube and ea in the Problem Solving forum
“Given that 72% of the items are cubes, we have % of blue cubes + % of red cubes = 72% => 54% + % of red cubes = 72% => % of red cubes = 72% – 54% = 18% The correct answer: A Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes ...”
March 6, 2019
Jay@ManhattanReview posted a reply to Geoff is setting up an aquarium and must choose 4 of 6 in the Problem Solving forum
“Number of ways of choosing different fish out of 6 = 6C4 = 6C2 = 6.5 / 1.2 = 15; Number of ways of choosing 2 different plants out of 3 = 3C2 = 3C1 = 3 Total number of ways of setting up an aquarium = 15*3 = 45 The correct answer: D Hope this helps! -Jay _________________ Manhattan ...”
March 6, 2019
Brent@GMATPrepNow posted a reply to Is xy>3? in the Data Sufficiency forum
“Target question: Is xy > 3 ? Statement 1: (7^x) > 729 Since there''s no information about y, we cannot answer the target question with certainty. Statement 1 is NOT SUFFICIENT Statement 2: (9^y) = 7 Since there''s no information about x, we cannot answer the target question with ...”
March 5, 2019
ceilidh.erickson posted a reply to For similar homes and comparable residents, home insurance f in the Critical Reasoning forum
“When we''re asked to EVALUATE an argument, we need to establish the conclusion of the argument and its supporting premises. We then need to determine what information is MISSING. Premises: - For similar homes and comparable residents, home insurance for theft has always cost more in ...”
March 5, 2019
ceilidh.erickson posted a reply to Quasars are so distant that their light has taken billions o in the Sentence Correction forum
“For more on when to use PAST PERFECT v. SIMPLE PAST tenses, see: https://www.beatthegmat.com/og-10-native-american-burial-sites-t45325.html#577377 https://www.beatthegmat.com/by-1945-the-us-had-been-t274960.html#714092”
March 5, 2019
ceilidh.erickson posted a reply to Quasars are so distant that their light has taken billions o in the Sentence Correction forum
“This question is testing VERB TENSES. When you see differences in verb tense in answer choices, ask yourself: "when are these events happening in time?" The intended meaning of the sentence should be: - light left these quasars long in the past - we''re just seeing that light now ...”
March 5, 2019
ceilidh.erickson posted a reply to For the 5 days shown in the graph, how many kilowatt-hours in the Problem Solving forum
“To find the median, first list the daily kilowatt-hours in order: 19, 24, 27, 29, 31 The median = 27 To find the average, we could add up all the terms and divide by 5. Instead, though, just see how much each term differs from the median: 19 --> 27 - 8 24 --> 27 - 3 27 29 --> 27 ...”
March 5, 2019
ceilidh.erickson posted a reply to Among the members of the Malmo family, there are three times in the Problem Solving forum
“Overlapping Sets are a common question type on the GMAT, and the double-set matrix is often the easiest way to solve. For more on how to use the matrix, see: https://www.beatthegmat.com/for-what-percent-of-those-tested-for-a-certain-infection-was-t303715.html#818652 ...”
March 5, 2019
ceilidh.erickson posted a reply to Among the members of the Malmo family, there are three times in the Problem Solving forum
“This is an OVERLAPPING SETS question. The best way to approach it is with a DOUBLE-SET MATRIX: https://i.postimg.cc/GBrL4B72/Screenshot-2019-03-05-13-38-45.png If there are three times as many members who do not wear glasses as members who do, we can express the total who wear glasses as x and ...”
March 5, 2019
ceilidh.erickson posted a reply to Set X consists of the positive multiples of 5, and set Y in the Problem Solving forum
“There is no real shortcut to this problem; we simply have to count the results. Set X: 15 3 * 10 = 30 3 * 15 = 45 3 * 20 = 60 3 * 25 = 75 3 * 30 = 90 Anything greater than 30 would yield a product greater than 100, so those are the only results for 3. Now try 5: 5 * 5 = 25 5 * 10 = 50 ...”
March 5, 2019
Brent@GMATPrepNow posted a reply to x is the product of all even numbers from 2 to 50, inclusive in the Problem Solving forum
“Here''s a very similar (official) question to practice with: https://www.beatthegmat.com/arthemetic-question-on-factors-and-prime-numbers-t275643.html Cheers, Brent”
March 5, 2019
Brent@GMATPrepNow posted a reply to Joey works at a clothing store and receives an employee in the Problem Solving forum
“Let R = REGULAR price of the item Joey and receives an employee discount of 10 percent off the regular price of any item. So, Joey pays 90% of the REGULAR price. In other words, 0.9R = the DISCOUNT price that Joey actually pays What is the regular price of an item that Joey purchases for ...”
March 5, 2019
Jay@ManhattanReview posted a reply to x is the product of all even numbers from 2 to 50, inclusive in the Problem Solving forum
“We have x = 2.4.6.8.....48.50 = (2.1).(2.2).(2.3).........(2.24).(2.25 ) = 2^(25)*(1.2.3........25) = 2^(25)∗25! You may note that 2^(25)∗25! is divisible by all the prime numbers less than 25. Again, note that two consecutive integers are co-prime to each other, i.e., they don''t share ...”
March 5, 2019
Brent@GMATPrepNow posted a reply to In how many ways can 16 different gits be divided among four in the Problem Solving forum
“Let''s say the children are named A, B, C, and D Stage 1: Select 4 gifts to give to child A Since the order in which we select the 4 gifts does not matter, we can use combinations. We can select 4 gifts from 16 gifts in 16C4 ways (= 16!/(4!)(12!)) So, we can complete stage 1 in ...”
March 4, 2019
Jay@ManhattanReview posted a reply to Consider the following sets: L = {3, 4, 5, 5, 6, 7} M = {2, in the Problem Solving forum
“The standard deviation measures the spread of the data w.r.t. its mean value. It is applied in comparing sets of data which may have the same mean but a different range. For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly ...”
March 4, 2019
Jay@ManhattanReview posted a reply to In the correctly-worked multiplication problem above, each s in the Data Sufficiency forum
“We can do the prime factorization of 1995. 1995 = 5*3*7*19. A possible combination of numbers could be 5*3 = 15 and 7*19 = 133 (Not possible since 133 is not a 2-digit number). Another possible combination could be 5*7 = 35 and 3*19 = 57. This is also not possible since in 35 and 57, digit ...”
March 4, 2019
Jay@ManhattanReview posted a reply to The next number in a certain sequence is defined by multiply in the Data Sufficiency forum
“Let''s take each statement one by one. (1) The ninth term in this sequence is 81. Case 1: Say k = 3, then the first nine terms are 1/81, 1/27, 1/9, 1/3, 1, 3, 9, 27, and 81. The terms greater than 1 are 3, 9, 27, and 81. The answer is 4. Case 2: Say k = 9, then the first nine terms are ...”
March 4, 2019
Jay@ManhattanReview posted a reply to Seven different numbers are selected from the integers 1 to in the Data Sufficiency forum
“Let''s take each statement one by one. (1) The range of the seven remainders is 6. Case 1: Say the seven different numbers are 3, 4, 5, 6, 7, 8, and 9. Reminders of above numbers, when divided by 7, are 3, 4. 5, 6, 0, 1, and 2. We see that the range of the seven remainders = 6 – 0 = 6. ...”
March 4, 2019
Brent@GMATPrepNow posted a reply to The positive two-digit integers x and y have the same digits in the Problem Solving forum
“Another approach is to test some values for x and y that satisfy the given information. Positive two-digit integers x and y have the same digits, but in reverse order So, it COULD be the case that x = 12 and y = 21 Which of the following must be a factor of x + y? x + y = 12 + 21 = 33 ...”
March 3, 2019
Rich.C@EMPOWERgmat.com posted a reply to Working continuously 24 hours a day, a factory bottles Soda in the Problem Solving forum
“Hi All, We''re told that working continuously 24 hours a day, a factory bottles Soda Q at a rate of 500 liters per second and Soda V at a rate of 300 liters per second and that TWICE as many bottles of Soda V as of Soda Q are filled at the factory each day. We''re asked for the ratio of the ...”
March 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to Two hoses are pouring water into an empty pool. Hose 1 alone in the Problem Solving forum
“Hi All, This question is a variation of a ''Work Formula'' question (it involves 2 ''entities'' working on the same task together), so we can use the Work Formula to solve it. Work = (A)(B)/(A+B) where A and B are the individual times that it takes the 2 entities to complete the task on their ...”
March 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to Range Problem.,... in the Problem Solving forum
“Hi All, We''re told that Set X consists of PRIME numbers {3, 11, 7, K, 17, 19}, the integer Y represents the PRODUCT of all elements in Set X and 11Y is an EVEN number. We''re asked for the RANGE of Set X. This question is based on several Number Property rules - and doesn''t actually require ...”
March 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to In how many ways can the letters D, I, G, I, T be arranged in the Problem Solving forum
“Hi All, We''re asked to find the number of ways that the letters D, I, G, I, T be arranged so that the two I''s are NOT next to each other. Since the two "I"s cannot be side-by-side, there are a limited number of ways to arrange the 5 letters. As such, with a little permutation math ...”
March 2, 2019
Brent@GMATPrepNow posted a reply to Median of set T in the Problem Solving forum
“If we have a set of y INTEGERS, there are two possible cases when it comes to the MEDIAN. Case a: y is an ODD number, in which case the MEDIAN equals the one middle integer (when all of the integers are arranged in ascending order). In this case, the median must be an integer. Case b: y is an ...”
March 2, 2019
Jay@ManhattanReview posted a reply to In June 1989, what was the ratio of the number of sales tran in the Data Sufficiency forum
“Say, in June 1989, the number of sales transactions made by Salesperson X = x and the number of sales transactions made by Salesperson Y = y. We have to get the value of x /y. Let''s take each statement one by one. (1) In June 1989, Salesperson X made 50 percent more sales ...”
March 1, 2019
Jay@ManhattanReview posted a reply to Is the standard deviation of Set A greater than or equal to in the Data Sufficiency forum
“The standard deviation measures the spread of the data w.r.t. its mean value. It is applied in comparing sets of data which may have the same mean but a different range. For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly ...”
March 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to The product of the digits of the four-digit number h is 36. in the Problem Solving forum
“Hi All, We''re told that the product of the digits of the four-digit number H is 36 and no two digits of H are identical. We''re asked for the number of different possible values of H. While this question might seem complex, most of the work is based on basic Arithmetic (and some Permutation ...”
March 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to A motorcycle travels at a speed of x kilometers per p hours. in the Problem Solving forum
“Hi All, We''re told that a motorcycle travels at a speed of X KILOMETERS per P HOURS. We''re asked for the number of METERS it will travel in S SECONDS, in terms of S, P and X. (xps ≠ 0; 1 kilometer = 1000 meters). This question can be solved in a number of different ways, including by TESTing ...”
March 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to All assets in Karina's investment portfolio are divided in the Problem Solving forum
“Hi All, We''re told that all assets in Karina''s investment portfolio are divided between an IRA, 401k, and two separate taxable accounts and that NO two accounts have the SAME amount of money and all four have at least SOME money in them. If each account has a whole-number percent of Karina''s ...”
March 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to In a certain clothing store, the most expensive pair of in the Problem Solving forum
“Hi All, We''re told that in a certain clothing store, the MOST expensive pair of socks sells for one dollar LESS than TWICE the price of the CHEAPTEST pair of socks. A customer notices that for exactly $18, she can buy three fewer pairs of the most expensive socks than the cheapest socks. We''re ...” March 1, 2019 Rich.C@EMPOWERgmat.com posted a reply to Vivian drives to her sister’s house and back. She takes th in the Problem Solving forum “Hi All, We''re told that Vivian drives to her sister''s house and back. She takes the exact same route both ways; on the trip out she drives an average speed of 50 miles per hour and on the trip back she drives an average speed of 70 miles per hour. We''re asked for her approximate average speed ...” March 1, 2019 Rich.C@EMPOWERgmat.com posted a reply to Tips for improving GMAT from 500-700 in the GMAT Strategy forum “Hi Rahufalb, To start, the only practical way to properly measure your overall Test-taking skills during the course of your studies is to take a FULL-LENGTH CAT under realistic conditions (meaning that you should take a FULL CAT - with the Essay and IR sections, in a location that is NOT your ...” March 1, 2019 Brent@GMATPrepNow posted a reply to In a certain clothing store, the most expensive pair of in the Problem Solving forum “Let C = price of one pair of the CHEAPEST socks So, 2C - 1 = price of one pair of the MOST EXPENSIVE socks A customer notices that for exactly$18, she can buy three fewer pairs of the most expensive socks than the cheapest socks. As a word equation, we can write: (# of pairs of EXPENSIVE ...”
February 28, 2019
Brent@GMATPrepNow posted a reply to Two positive numbers differ by 12 and their reciprocals in the Problem Solving forum
“Two positive numbers differ by 12 Let x = the smaller number So x + 12 = the larger number NOTE: our goal is to find the value of x(x + 12) Their reciprocals differ by 4/5 We get: 1/x - 1/(x+12) = 4/5 Multiply both sides by x to get: 1 - x/(x + 12) = 4x/5 Multiply both sides by 5 to get: 5 ...”
February 28, 2019
Brent@GMATPrepNow posted a reply to In a town of 8,000 residents, 65 percent of all residents in the Problem Solving forum
“Another approach is to use the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it (aka overlapping sets questions). Here, we have a population of residents, and the two characteristics are: ...”
February 28, 2019
Brent@GMATPrepNow posted a reply to Working simultaneously and independently at an identical con in the Problem Solving forum
“Let''s assign a nice value to x (a value that will work well with all of the numbers 3, 4 and 6. Let''s say x = 24 GIVEN: 4 machines make x units in 6 days This means 4 machines make 24 units in 6 days So, 4 machines make 4 units in 1 day So, 1 machine makes 1 unit in 1 day From here, ...”
February 28, 2019
Brent@GMATPrepNow posted a reply to A certain club has 20 members. What is the ratio of the in the Problem Solving forum
“5-member committees Since the order in which we select the committee members does not matter, we can use COMBINATIONS We can select 5 people from 20 people in 20C5 ways 20C5 = (20)(19)(18)(17)(16)/(5)(4)(3)(2)(1) 4-member committees Since the order in which we select the committee members ...”
February 28, 2019
Brent@GMATPrepNow posted a reply to Train A and Train B began traveling towards each other from in the Problem Solving forum
“This is a SHRINKING GAP question. Train A traveled at 35 miles per hour and Train B traveled at 25 miles per hour, 35 mph + 25 mph = 60 mph So, the gap CLOSES at a rate of 60 mph Train A and Train B began traveling towards each other from opposite ends of a 500-mile long track at 1:00 PM ...”
February 28, 2019
Brent@GMATPrepNow posted a reply to In 1990 the budgets for projects Q and V were $660,000 and in the Problem Solving forum “One approach is to treat this is a rate question. In 1990 the GAP BETWEEN V''s budget and Q''s budget was$120,000 ($780,000 -$660,000 = $120,000) Each year, the budget for Q increased by$30,000 and the budget for V decreased by $10,000. In other words, the GAP BETWEEN the budgets ...” February 28, 2019 Jay@ManhattanReview posted a reply to One gram of a certain health food contains 7 percent of the in the Problem Solving forum “Since between vitamin E and vitamin A, the supply of vit A (3%) is less than vit E (7%), we must focus on the minimum requirement of vit A; since if the quantity of vit A is taken are, the quantity of vit E would also be taken care of. Given one gram of a certain health food contains 3 percent of ...” February 27, 2019 Jay@ManhattanReview posted a reply to Dan and Alex measure themselves against a tree in their in the Problem Solving forum “Say the height of Dan is 100 ft, thus, the height of the tree = 180 feet => Height of Alex = Height of the tree / (120%) = 180 / 120% = 150 feet Thus, Alex is taller than Dan by 150 – 100 = 50%. The correct answer: E Hope this helps! -Jay _________________ Manhattan Review ...” February 27, 2019 Jay@ManhattanReview posted a reply to Working alone, pump A can empty a pool in 3 hours. Working a in the Problem Solving forum “Work done by pump A and B together in 1 hour = 1/3 + 1/2 = 5/6 part of the pool Thus, it takes 1 / (5/6) = 6/5 hours or (6/5)*60 = 72 minutes to empty the pool The correct answer: A Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes in ...” February 27, 2019 Jay@ManhattanReview posted a reply to In the xy-coordinate system, rectangle ABCD is inscribed in the Problem Solving forum “Since the equation of the circle is x^2 + y^2 = 25, its radius is √25 = 5 and the diameter is 2*5 = 10. Since vertex B lies on the x^2 + y^2 = 25 as well as on y = 3x + 15, the x and y coordinates of vertex B would satisfy both the equations. Plugging-in y = 3x + 15 in x^2 + y^2 = 25, we get ...” February 27, 2019 Jay@ManhattanReview posted a reply to What is the cube root of w? in the Data Sufficiency forum “Let''s take each statement one by one. (1) The 5th root of w is 64. => w^(1/5) = 64 w = (64)^5 => w^(1/3) = (64)^5 = D Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes in Manhattan | GMAT Tutoring New York | GRE Prep Seattle | ...” February 27, 2019 Rich.C@EMPOWERgmat.com posted a reply to Materials for solving. in the GMAT Strategy forum “Hi Zaidf1997, It sounds like you''re just beginning your studies. Have you done any studying so far or are you just beginning? If you are just starting out, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can take 2 for free at www.mba.com (and they come with some ...” February 26, 2019 ceilidh.erickson posted a reply to John has to hammer 100 railroad spikes for a new line his in the Problem Solving forum “If John completed the entire task by himself, the time would be 100/8 --> 25/2, or 12 and 1/2 hrs. He would be halfway done after 6 and 1/4 hrs, and there would be 50 spikes remaining. If he and Paul work together at the same rate for the remaining 50 spikes, their combined rate would be ...” February 26, 2019 ceilidh.erickson posted a reply to Passengers must exit airplanes swiftly after accidents, sinc in the Critical Reasoning forum “We need to select an answer that is consistent with the given information: - Passengers must exit airplanes swiftly after accidents, since gases released following accidents are toxic to humans and often explode soon after being released. - In order to prevent passenger deaths from gas ...” February 26, 2019 ceilidh.erickson posted a reply to Not Only But Also vs Not Only, But Also in the Sentence Correction forum “Generally we don''t need commas to separate a simple list of 2 things with conjunctions. It doesn''t matter whether it''s a simple conjunction (e.g. "and") or a complex conjunction structure (e.g. "not only__ but also__") I like pomegranates and figs. I like not only ...” February 26, 2019 ceilidh.erickson posted a reply to The possible long-term health risks to airline personnel who in the Sentence Correction forum “This question is testing SUBJECT-VERB agreement. The subject of this sentence is RISKS: The ... risks (to airline personnel (who ...)) has been a concern ... The GMAT often puts long, distracting modifiers between the subject & the verb to confuse your ear. If you notice a split between ...” February 26, 2019 ceilidh.erickson posted a reply to According to a recent study, hand sanitizers require a 60 pe in the Sentence Correction forum “This question is testing IDIOMS. The correct idiom in this case is "require ___ to do ____." (A) require a 60 percent minimum alcohol concentration for the killing of - "for the killing of" is unnecessarily wordy. "To kill" is preferred. (B) require that ...” February 26, 2019 ceilidh.erickson posted a reply to A middleweight black hole weighs in at roughly 500 solar mas in the Sentence Correction forum “This question is testing simple parallelism. The correct parallel structure (logically and grammatically) is: 1. hundreds of times more massive than ___ 2. but thousands or even millions of times less massive than ____ (A) thousands or even millions of times less in its mass as - ...” February 26, 2019 ceilidh.erickson posted a reply to Thomas Mann's novel Doctor Faustus offers an examination not in the Sentence Correction forum “This two-part parallelism - also known as CLOSED PARALLELISM - is very common on the GMAT. Any time you see the following: BOTH ____ AND ____ EITHER ____ OR ______ NOT ONLY _____BUT ALSO _______ NOT ________ BUT _________ etc, ... you need to make sure that what comes right after the ...” February 26, 2019 ceilidh.erickson posted a reply to Thomas Mann's novel Doctor Faustus offers an examination not in the Sentence Correction forum “Be careful - prepositions do not have to be the same in order to be parallel! You''re over-applying parallelism where you don''t need it. For example, I could say: I jumped both OVER the rocks and INTO the lake. As long as both prepositional phrases fit (grammatically, idiomatically, and ...” February 26, 2019 Brent@GMATPrepNow posted a reply to Is xy+zt+yz+tx positive? in the Data Sufficiency forum “Target question: Is xy + zt + yz + tx positive? Statement 1: |x| = |y| = |z| = t Let''s TEST some values. There are several values of x, y, z and t that satisfy statement 1. Here are two: Case a: x = y = z = t = 1. In this case, xy + zt + yz + tx = (1)(1) + (1)(1) + (1)(1) + (1)(1) = 4. ...” February 26, 2019 Brent@GMATPrepNow posted a reply to A manufacturer makes umbrellas at the cost of c dollars per in the Problem Solving forum “This is a tough one to use the INPUT-OUTPUT approach, but here is goes: Let c =$2 (it cost $2 to make each umbrella) Let x = 10 (we make 10 umbrellas) Let r =$5 (the retail price is $5 per umbrella) Let b =$0 (the below-cost sale price is $0 per umbrella) So, the manufacturer made 10 ...” February 26, 2019 Jay@ManhattanReview posted a reply to 4 friends A, B, C, and D appeared in a certain examination. in the Problem Solving forum “As per the given information, b = a – 33.33% of a => b = 2a/3; b = c – 50% of c = c/2 => c = 4a/3 d ≥ 2.5b = 2.5*(2a/3) d ≥ 5a/3 a + c = a + 4a/3 = 7a/3 The maximum percentage by which the combined score of A and C is more than the score of D = C Hope this helps! ...” February 26, 2019 Jay@ManhattanReview posted a reply to If P is the center of the circle shown above, and BAC = 30º in the Problem Solving forum “Area of the circle = πr^2, where r = AC/2 If we get the value of AC, we get the answer. Note that since AC is a diameter, it subtends 90º on the circumference of the circle. Thus, triangle ABC is a rightangled triangle of 30-60-90 type. A rightangled triangle of 30-60-90 type has its sides ...” February 26, 2019 Jay@ManhattanReview posted a reply to Working continuously 24 hours a day, a factory bottles Soda in the Problem Solving forum “Since the question asks for the ratio and not the actual answer, we need not take 24 hours per day into consideration. Ratio of Rate of filling Soda Q : Rate of filling Soda V :: 500 : 300 => 5 : 3. Ratio of number of bottles of Soda Q : number of bottles of Soda V :: 2 : 1 Thus, ...” February 26, 2019 Brent@GMATPrepNow posted a reply to How many positive two-digit numbers are odd, not divisible b in the Problem Solving forum “After about 30 seconds, I recognized that I couldn''t see a nice straightforward solution (one that doesn''t involve considering multiple cases), so I had 3 options: 1) Keep searching for a nice straightforward solution 2) Guess and move on 3) List the possible outcomes Since the answer ...” February 25, 2019 Brent@GMATPrepNow posted a reply to Nine identical chips are numbered from 1 to 9 (one different in the Problem Solving forum “ODDS: 1, 3, 5, 7, 9 EVENS: 2, 4, 6, 8 Take the task of removing the 9 chips and break it into stages. Stage 1: Select an ODD number to be the 1st selection There are 5 ODDs to choose from. So, we can complete stage 1 in 5 ways Stage 2: Select an EVEN number to be the 2nd selection ...” February 25, 2019 Brent@GMATPrepNow posted a reply to All assets in Karina's investment portfolio are divided betw in the Problem Solving forum “Let''s say Karina''s entire portfolio is worth$100 altogether. So, we want to divide this $100 into four integer amounts: w, x, y, z, where w < x < y < z, and we want to minimize the value of z In order to MINIMIZE the value of the z, we must MAXIMIZE the values of w, x, and y. Now ...” February 25, 2019 Brent@GMATPrepNow posted a reply to Vivian drives to her sister’s house and back. She takes th in the Problem Solving forum “One approach is to assign a "nice" value (one that works well with 50 mph and 70 mph) to the distance her sister''s house. So, let''s say the distance is 350 miles Average speed = (total distance traveled)/(total travel time) TOTAL distance = 350 miles + 350 miles = 700 miles ...” February 25, 2019 Jay@ManhattanReview posted a reply to How many miles long is the route from Houghton to Callahan? in the Data Sufficiency forum “Say the distance from Houghton to Callahan is D miles. Let''s take each statement one by one. (1) It will take 1 hour less time to travel the entire route at an average rate of 55 miles per hour than at an average rate of 50 miles per hour. => D/50 – D/55 = 1 D = 5500 miles. ...” February 25, 2019 Jay@ManhattanReview posted a reply to All assets in Karina's investment portfolio are divided betw in the Problem Solving forum “Say the four accounts are A, B, C and D. We know that the percentage values of investments are positive integers. Say the largest percentage values of the investments is for D; thus, with A, B and C being the minimum and distinct, A = 1%, B = 2% and C = 3%; thus D = 100 – 1 – 2 – 3 = 94%. ...” February 25, 2019 Jay@ManhattanReview posted a reply to Vivian drives to her sister’s house and back. She takes th in the Problem Solving forum “Say the one-way distance is 350 miles. I chose 350 since 350 is the LCM of 50 and 70. Time taken for the out trip = Distance / Speed = 350 / 50 = 7 hours; Time taken for the out trip = Distance / Speed = 350 / 70 = 5 hours Aerage speed = Total distance / Total time = (2*350) / (7 + 5) = 58.33 ...” February 25, 2019 Rich.C@EMPOWERgmat.com posted a reply to Ten theater students are to begin work on a set for a in the Problem Solving forum “Hi All, We''re told that 10 theater students are to begin work on a set for a musical. Working at a constant rate, they will finish the set in 60 days, but the director of the musical decides they need to finish in 50 days. We''re asked for the number of ADDITIONAL theater students we would ...” February 24, 2019 Rich.C@EMPOWERgmat.com posted a reply to A circular lawn with a radius of 5 meters is surrounded by a in the Problem Solving forum “Hi All, We''re told that a circular lawn with a radius of 5 meters is surrounded by a circular walkway that is 4 meters wide. We''re asked for the area of the walkway. This is an example of a ''punch out'' question - we need to find the area of the ENTIRE shape and then ''punch out'' the part ...” February 24, 2019 Rich.C@EMPOWERgmat.com posted a reply to Kim has 40 percent more money than Sal and Sal has 20 in the Problem Solving forum “Hi All, We''re told that Kim has 40 percent MORE money than Sal, Sal has 20 percent LESS money than Phil and Sal and Phil have a combined total of$1.80. We''re asked for the amount of money that Kim has. This question can be approached in a couple of different ways, including some brute-force ...”
February 24, 2019
Brent@GMATPrepNow posted a reply to In a certain class, the ratio of girls to boys is 5:4. How m in the Data Sufficiency forum
“ Given: In a certain class, the ratio of girls to boys is 5:4. Let G = number of girls in the class Let B = number of boys in the class We can write: G/B = 5/4 Cross multiply to get: 4G = 5B Rearrange to get: 4G - 5B = 0 Target question: What is the value of G Statement 1: If four ...”
February 24, 2019
Brent@GMATPrepNow posted a reply to Kim has 40 percent more money than Sal and Sal has 20 in the Problem Solving forum
“Let x = Phil''s money Sal has 20 percent LESS money than Phil So, Sal''s money = (Phil''s money) - (20% Phil''s money) = x - (20% of x) = x - 0.2x = 0.8x Kim has 40 percent more money than Sal So, Kim''s money = (Sal''s money) + (40% Sal''s money) = (0.8x) + (40% of 0.8x) = ...”
February 24, 2019
Brent@GMATPrepNow posted a reply to A straight line in the xy-plane has a slope of 2 and a in the Problem Solving forum
“The question conveniently gives us the information to write the equation of the line in slope y-intercept form, y = mx + b, where m = slope and b = the y-intercept. Line in the xy-plane has a slope of 2 and a y-intercept of 2 So, the equation of the line is: y = 2x + 2 On this line, what is ...”
February 24, 2019
Brent@GMATPrepNow posted a reply to If y >= 0, What is the value of x? in the Data Sufficiency forum
“Target question: What is the value of x? Given: y ≥ 0 Statement 1: |x - 3| ≥ y Let''s TEST some values. There are several values of x and y that satisfy statement 1. Here are two: Case a: x = 10 and y = 2. We get |10 - 3| ≥ 2, which evaluates to be 7 ≥ 2, which satisfies ...”
February 23, 2019
Brent@GMATPrepNow posted a reply to The total of company C's assets in 1994 was 300% greater in the Problem Solving forum
“The total of company C''s assets in 1992 was N dollars Company C''s assets in 1993 was 400% greater than the total in 1992 So, 1993 assets = (1992 assets) + (400% of 1992 assets) = (N) + (400% of N) = (N) + (400/100 x N) = N + 4N = 5N Company C''s assets in 1994 was 300% greater than the ...”
February 23, 2019
Brent@GMATPrepNow posted a reply to At a bakery, the price of a bagel ranges between $0.65 and$ in the Problem Solving forum
“The least expensive price for a bagel is $0.65 If a customer purchases 12 bagels (at$0.65 each), then he/she receives 13 bagels. So, the minimum amount that a customer could pay to receive 13 bagels = 12 x $0.65 =$7.80 Answer: B Cheers, Brent”
February 23, 2019
Brent@GMATPrepNow posted a reply to a, b, and c are positive integers. Is a+b+c an odd number? in the Data Sufficiency forum
“ Given: a, b, and c are positive integers. Target question: Is a + b + c an odd number? Statement 1: ab is an odd number No information about c. NOT SUFFICIENT Statement 2: c is an odd number No information about a or b. NOT SUFFICIENT Statements 1 and 2 combined If ab ...”
February 22, 2019
Brent@GMATPrepNow posted a reply to In how many ways a cricket team consisting of 5 batsmen, 4 in the Problem Solving forum
“Take the task of creating a cricket team and break it into stages. Stage 1: Select 5 batsmen Since the order in which we select the batsmen does not matter, we can use combinations. We can select 5 batsmen from 7 batsmen in 7C5 ways (21 ways) So, we can complete stage 1 in 21 ways ...”
February 22, 2019
Brent@GMATPrepNow posted a reply to If 1/x-1/y=1/z, what is the value of y, in terms of x and z? in the Problem Solving forum
“We can also solve the question algebraically. GIVEN: 1/x - 1/y = 1/z Multiply both sides by x to get: 1 - x/y = x/z Multiply both sides by y to get: y - x = xy/z Multiply both sides by z to get: yz - xz = yx Rearrange to get y terms on one side: yz - yx = xz Factor left side: y(z - x) = ...”
February 22, 2019
Jay@ManhattanReview posted a reply to Of the 80 house in a development, 50 have a two-car garage, in the Problem Solving forum
“Number of houses with a two-car garage = 50; Number of houses with in-the-ground swimming pool = 40; Number of houses with both a two-car garage and in-the-ground swimming pool = 35; Thus, the number of houses with a two-car garage or in-the-ground swimming pool = 50 + 40 – 35 = 55 Thus, ...”
February 22, 2019
Jay@ManhattanReview posted a reply to Given that p is a positive even integer with a positive unit in the Problem Solving forum
“Given that p is a positive even integer with a positive units digit, the units digit of p can be 2, 4, 6, or 8. Let''s try for these possible values of p. 1. Say p = 2; p^3 – p^2 = 2^3 – 2^2 = 8 – 4 = 4 ≠ 0. Unit digit of p cannot be 2; 2. Say p = 4; p^3 – p^2 = 4^3 – 4^2 = 64 – ...”
February 22, 2019
Brent@GMATPrepNow posted a reply to Last year the range of the annual salaries of the 100 in the Problem Solving forum
“A quick solution is to assign some values to the highest paid and lowest paid workers Let $10,000 = the lowest salary LAST YEAR Let$40,000 = the highest salary LAST YEAR This satisfies the condition that the range LAST YEAR = $30,000 If the annual salary of each of the 100 employees this ...” February 21, 2019 Brent@GMATPrepNow posted a reply to The sum of two integers is 27. The larger integer is 25% in the Problem Solving forum “Let x = the smaller integer So, 1.25x = the larger integer (since the larger integer is 25% greater than the smaller integer) The sum of two integers is 27. We can write: x + 1.25x = 27 Simplify: 2.25x = 27 Solve: x = 27/2.25 IMPORTANT: What''s a nice fast way to evaluate 27/2.25? An easy ...” February 21, 2019 Brent@GMATPrepNow posted a reply to What is the greatest positive three-digit number that is div in the Problem Solving forum “One approach is to check each answer choice, beginning with the largest answer choice E. 840 840 is divisible by 2, 3, 4, 5, 6 and 7 Answer: E Cheers, Brent” February 21, 2019 Brent@GMATPrepNow posted a reply to What is the largest digit n for which the number 123,45n is in the Problem Solving forum “RULE: if the SUM of the digits of a number is divisible by 3, then that number is divisible by 3 Take, for example, the number 1,001,226 1 + 0 + 0 + 1 + 2 + 2 + 6 = 12 Since 12 is divisible by 3, we know that 1,001,226 is divisible by 3 If 123,45n is divisible by 3, then 1 + 2 + 3 + 4 + 5 + n ...” February 21, 2019 Brent@GMATPrepNow posted a reply to In the figure above, the angle marked at c has been created in the Data Sufficiency forum “Target question: What is the sum of a, b, and c? This is a good candidate for rephrasing the target question. Since angles on a line add to 180°, we already know that b + c = 180 We get: a + b + c = a + 180 So, in order to find the sum of a, b and c, we need only find the value of a ...” February 21, 2019 Brent@GMATPrepNow posted a reply to At a certain committee meeting only associate professors and in the Problem Solving forum “Notice that the question asks us to find that TOTAL number of people present. In other words, it the question does NOT ask us to find the number of associate professors or assistant professors present. Since each person brings THREE items, and since total of 21 items were brought (10 pencils ...” February 21, 2019 Brent@GMATPrepNow posted a reply to In a class of 30 students, 2 students did not borrow any in the Problem Solving forum “The average (arithmetic mean) number of book borrowed per student was 2. Since there are 30 students altogether, the total number of borrowed books = (2)(30) = 60 2 students borrowed 0 books: total of 0 books 12 students borrowed 1 book each: total of 12 books 10 students borrowed 2 books ...” February 21, 2019 Brent@GMATPrepNow posted a reply to If there are more than two numbers in a certain list, is in the Data Sufficiency forum “Target question: Is each of the numbers n the list equal to zero? Given: There are more than 2 numbers in the list Statement 1: The product of any 2 numbers in the list is ZERO There are several possible sets that satisfy this condition. Here are two: Case a: the set is {0, 0, 0} in ...” February 21, 2019 Jay@ManhattanReview posted a reply to If there are more than two numbers in a certain list, is in the Data Sufficiency forum “Let''s take each statement one by one. 1) The product of any two numbers in the list is equal to 0. Case 1: Set: {0, 0, 0, 0, 0}. The answer is yes. Case 2: Set: {0, 0, 0, 0, 1}. The answer is no. No unique answer. Insufficient. 2) The sum of any two numbers in the list is equal to 0. ...” February 21, 2019 Jay@ManhattanReview posted a reply to How old, rounded to the nearest year, was Jim in May 1989? in the Data Sufficiency forum “Let''s take each statement one by one. 1) Jim''s friend Steve, who is exactly 2 years older than Jim, turned 25 years old in 1972. => Jim turned 23 years in 1972; thus, he would turn 23 + (1989 – 1972) = 40 in 1989. However, this is insufficient. The question asks, "How old, ...” February 21, 2019 Jay@ManhattanReview posted a reply to In a class of 30 students, 2 students did not borrow any in the Problem Solving forum “Total number of books borrowed = T = 30*2 = 60; Total number of books borrowed by 12 students = A = 1*12 = 12; Total number of books borrowed by 10 students = B = 2*10 = 20; Thus, the number of students who borrowed at least 3 books = 30 – 2 – 12 – 10 = 6; Since we need to maximize ...” February 21, 2019 Jay@ManhattanReview posted a reply to Two hoses (A and B) are filling a pool. Working alone at in the Problem Solving forum “Working together hoses A and B will fill 1/6 + 1/4 = 5/12 part of the pool Thus, they together can fill completely in 12/5 hours Given that they together filled half the pool, they would work for 1/2 of 12/5 = 6/5 hours Part of the work done by hose B during that period = 1/4*6/5 = 3/10 ...” February 21, 2019 Brent@GMATPrepNow posted a reply to Is mn < 10? in the Data Sufficiency forum “Target question: Is mn < 10? Statement 1: m < 5 and n < 2 Let''s TEST some values. There are several values of m and n that satisfy statement 1. Here are two: Case a: m = 0 and n = 0. In this case mn = (0)(0) = 0. So, the answer to the target question is YES, mn IS less than 10 ...” February 20, 2019 Brent@GMATPrepNow posted a reply to Bite-sized video lessons from GMAT Prep Now in the GMAT Math forum “Data Sufficiency lesson #4: GMAT Data Sufficiency Strategies - Part I Video : https://www.youtube.com/watch?v=Ep09hi1OJpI Cheers, Brent” February 20, 2019 Brent@GMATPrepNow posted a reply to John takes 15 hours to complete a certain job, while Bill ta in the Problem Solving forum “Let''s first see what happens if Steven works as fast as possible. Since Bill can complete the job in 6 hours, Steven must complete the job in a little more than 6 hours. For example, we COULD see what happens if Steven takes 6.000000000000001 hours to complete the job. Unfortunately, ...” February 20, 2019 Brent@GMATPrepNow posted a reply to If x, y, and z are three-digit positive integers and if x = in the Data Sufficiency forum “Target question: Is the hundreds digit of x equal to the sum of the hundreds digits of y and z ? Notice that there are essentially 3 ways for the hundreds digit of x to be different from the sum of the hundreds digits of y and z Scenario #1: the hundreds digits of y and z add to more than 9. ...” February 20, 2019 Jay@ManhattanReview posted a reply to If x, y, and z are three-digit positive integers and if x = in the Data Sufficiency forum “Say, x = abc; y = def; z = ghi We are given hat x = y + z. Thus, abc = def + ghi We have to determine whether a = d + g. This is true if there is no carryover from the tens digits'' sum, or e + h ≤ 9. (1) The tens digit of x is equal to the sum of the tens digits of y and z. e ...” February 20, 2019 Jay@ManhattanReview posted a reply to In the figure above, if x and y are each less than 90 and PS in the Data Sufficiency forum “Given: 1. PS is parallel to QR; 2. xº < 90º and yº < 90º We have to determine whether PQ < SR. Let''s take each statement one by one. (1) x > y Since 0 < x < 90 and 0 < y < 90, and x > y, we can vizualize that SR will be flatter than PQ, thus, PQ ...” February 20, 2019 Jay@ManhattanReview posted a reply to If two integers are chosen at random out of the set {2, 5, 7 in the Problem Solving forum “Number of ways, we can choose 2 integers out of 4 = 4C2 = 4.3/1.2 = 6 In the following for ways, the chosen two integers can be written in a^2 – b^2 form. (a). 2 x 8 = 16 = 5^2 – 3^2; (b). 5 x 8 = 40 = 7^2 – 3^2; (c). 5 x 7 = 35 = 6^2 – 3^2; (d). 7 x 8 = 56 = 9^2 – 5^2 Thus, ...” February 20, 2019 Jay@ManhattanReview posted a reply to The figure shown represents a board with 4 rows of pegs, and in the Problem Solving forum “So, there are three ways by which the ball can go in Cell 2. If the ball goes... 1. Left --> Left --> Right; probability = 1/2*1/2*1/2 = 1/8; 2. Left --> Right --> Right; probability = 1/2*1/2*1/2 = 1/8; 3. Right --> Left --> Left; probability = 1/2*1/2*1/2 = 1/8 Total ...” February 20, 2019 Rich.C@EMPOWERgmat.com posted a reply to Which of the following points is the intersection between in the Problem Solving forum “Hi All, We''re asked which of the following points is the intersection between the lines y = 3x + 6 and y = -2x - 4. This question can be solved in a number of different ways, including by TESTing THE ANSWERS. Since we''re dealing with two lines - and we now that the two lines intersect - ...” February 19, 2019 Rich.C@EMPOWERgmat.com posted a reply to A certain taxi company charges$3.10 for the first 1/5 of in the Problem Solving forum
“Hi All, We''re told that a certain taxi company charges $3.10 for the first 1/5 of a mile plus$0.40 for each additional 1/5 of a mile. We''re asked for the total charge for a taxi ride that was 8 miles long? The prompt gives us the price per 1/5 of a mile for a taxi ride. It''s worth noting ...”
February 19, 2019
Rich.C@EMPOWERgmat.com posted a reply to George bought a large electronic item with a 15% off coupon in the Problem Solving forum
“Hi All, We''re told that George bought a large electronic item with a 15% off coupon and paid a total bill. When he got outside, he studied the receipt and realize that he mistakenly had been given DOUBLE the discount of the coupon, even though there was no double-coupon offer in effect that ...”
February 19, 2019
Brent@GMATPrepNow posted a reply to George bought a large electronic item with a 15% off coupon in the Problem Solving forum
“George was SUPPOSED to receive a 15% discount, but he received a 30% discount. So, he should have returned 15% of the original cost. However, the manager asked for half that amount (i.e., 7.5% of the original cost) In other words, 7.5% of the original cost = $40.50 IMPORTANT: at this point, ...” February 19, 2019 Brent@GMATPrepNow posted a reply to Is x-y+1 greater than x+y-1 ? in the Data Sufficiency forum “Target question: Is x - y + 1 > x + y - 1 ? This is a good candidate for rephrasing the target question. Take: x - y + 1 > x + y - 1 Subtract x from both sides to get: -y + 1 > y - 1 Add y to both sides to get: 1 > 2y - 1 Add 1 to both sides to get: 2 > 2y Divide both ...” February 19, 2019 Brent@GMATPrepNow posted a reply to Anna has to visit at least 2 European cities on her vacation in the Problem Solving forum “We need to consider 3 different cases: i) Anna visits 2 cities ii) Anna visits 3 cities iii) Anna visits 4 cities i) Anna visits 2 cities There are 4 options for the FIRST city and 3 options for the SECOND city So, the total number of 2-city itineraries = (4)(3) = 12 ii) Anna visits 3 ...” February 19, 2019 Brent@GMATPrepNow posted a reply to Which of the following points is the intersection between in the Problem Solving forum “KEY CONCEPT: The point of intersection (call P) of the lines y = 3x + 6 and y = -2x - 4 will be such that the x- and y-coordinates of P will satisfy BOTH equations. Since both equations are set equal to y, we can write: 3x + 6 = -2x - 4 Add 2x to both sides: 5x + 6 = - 4 Subtract 6 from both ...” February 19, 2019 Jay@ManhattanReview posted a reply to One-sixth of the attendees at a certain convention are femal in the Problem Solving forum “Already replied two days back... https://www.beatthegmat.com/one-sixth-of-the-attendees-at-a-certain-convention-are-t306503.html#827021 Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes San Diego | GMAT Tutoring Atlanta | GRE Prep Jacksonville | ...” February 19, 2019 Jay@ManhattanReview posted a reply to Mr. Smith purchases books from the bargain bin. He buys only in the Data Sufficiency forum “Say the number of$1, $2, and$7 books are x, y, and z, respectively. We have to get the value of z. Let''s take each statement one by one. (1) Mr. Smith spends $24 on bargain books. => x + 2y + 7z = 24 Can''t get the unique value of z. z can be 1, 2 or 3. No unique value. ...” February 19, 2019 Jay@ManhattanReview posted a reply to How many apples are there in the box? in the Data Sufficiency forum “Average (arithmetic mean) weight of the apples = (Total weight of the apples) / (Number of apples) Number of apples = (Total weight of the apples) / (Average (arithmetic mean) weight of the apples) = 200/8 = 25. Sufficient. The correct answer: C Hope this helps! -Jay ...” February 19, 2019 Jay@ManhattanReview posted a reply to In a class of 30 students, Emma secured the third rank among in the Data Sufficiency forum “Refer to the images given below, which are self-explanatory. https://i.postimg.cc/PPp0vFXt/Tab1.png https://i.postimg.cc/bD53zp21/Tab2.png The correct answer: B Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes San Diego | GMAT Tutoring ...” February 19, 2019 Brent@GMATPrepNow posted a reply to How many positive perfect cubes are divisors of 4^6? in the Problem Solving forum “4⁶ = (2²)⁶ = 2¹² Since 2¹² = (2³)(2⁹), we know 2³ is a divisor of 2¹² Since 2¹² = (2⁶)(2⁶), we know 2⁶ is a divisor of 2¹² Since 2¹² = (2⁹)(2³), we know 2⁹ is a divisor of 2¹² Since 2¹² = (2¹²)(2⁰), we know 2¹² is a divisor of 2¹² Since 2¹² = ...” February 18, 2019 Brent@GMATPrepNow posted a reply to The squares of two consecutive positive integers differ by 5 in the Problem Solving forum “Let x = the smaller integer So, x+1 = the larger integer (since the numbers are CONSECUTIVE) The squares of two consecutive positive integers differ by 55. We can write: (x + 1)² - x² = 55 Expand: x² + 2x + 1 - x² = 55 Simplify: 2x + 1 = 55 So: 2x = 54 Solve: x = 54/2 = 27 Answer: ...” February 18, 2019 Jay@ManhattanReview posted a reply to Jason can stack two shelves in 3 hours and Maria can stack in the Problem Solving forum “Given that Jason can stack two shelves in 3 hours, he can stack 13 stacks in 3/2*13 = 39/2 hours and Maria can stack three shelves in 2 hours, she can stack 13 stacks in 2/3*13 = 26/3 hours Working together they together stack 13 shelves in reciprocal of B Hope this helps! -Jay ...” February 18, 2019 Jay@ManhattanReview posted a reply to If y is 80% greater than x, than x is what % less than y? ( in the Problem Solving forum “Say x = 100; thus, y = 100 + 80% of 100 = 100 + 80 = 80 Thus, x (= 100) is 80 less than y (= 180). Required percent = (80/180)*100% = 44 4/9% The correct answer: D Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Atlanta | GMAT Tutoring ...” February 18, 2019 Jay@ManhattanReview posted a reply to One-sixth of the attendees at a certain convention are in the Problem Solving forum “See the image below, which is self-explanatory. https://i.postimg.cc/NK2KbhBL/Students.png The correct answer: E Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Atlanta | GMAT Tutoring Philadelphia | GRE Prep Denver | TOEFL Prep Classes San ...” February 18, 2019 Jay@ManhattanReview posted a reply to John has to hammer 100 railroad spikes for a new line his co in the Problem Solving forum “Given that John can hammer 8 spikes per hour, time needed to hammer 100 spikes, working alone = 100/8 = 25/2 hours. Since John alone hammered half the number of spikes (100/2 = 50), the number of hours John worked alone = 1/2 of 25/2 = 25/4 hours Now John''s coworker Paul also joined him and ...” February 18, 2019 Jay@ManhattanReview posted a reply to In 2001, John invests x dollars in a special account that yi in the Problem Solving forum “Given that the sum$x amounted to $250 in 2006 and to$270 in 2008, we can deduce that the simple interest on $x for 2 years = 270 – 250 =$20 Thus, 20 = x*y*2/100 => xy = 1,000 Again, since the sum $x invested in 2001 amounted to$250 in 2006, SI for 5 years is $(250 – x). Thus, 250 ...” February 18, 2019 Brent@GMATPrepNow posted a reply to A scientist has 400 units of a 6% phosphoric acid solution, in the Problem Solving forum “We can solve this question with the weighted averages formula: Weighted average of groups combined = (group A proportion)(group A average) + (group B proportion)(group B average) + (group C proportion)(group C average) + ... Let x = the number of units of 12% phosphoric acid solution needed ...” February 16, 2019 Brent@GMATPrepNow posted a reply to If a = 15! + 13, which of the following are factors of a? I in the Problem Solving forum “Here''s a similar question to practice with: https://www.beatthegmat.com/divisibility-t111432.html Cheers, Brent” February 16, 2019 Brent@GMATPrepNow posted a reply to Phone plan A charges$1.25 for the first minute and $0.15 in the Problem Solving forum “Phone plan A charges$1.25 for the first minute and $0.15 for every minute thereafter. Let x = total duration of phone call (in minutes) So, the cost of an x-minute call =$1.25 + ($0.15)(x - 1) ASIDE: I created the expression ($0.15)(x - 1) because we pay $1.25 for the FIRST minute. So, if x = ...” February 16, 2019 Brent@GMATPrepNow posted a reply to A magician has five animals in his magic hat: 3 doves and 2 in the Problem Solving forum “Let''s apply probability rules First notice that, to get a matched pair, we can select 2 doves or 2 rabbits. So, P(matched pair) = P(1st pick is rabbit AND 2nd pick is rabbit OR 1st pick is dove AND 2nd pick is dove) We can now apply our AND and OR rules to get: P(matched pair) = x P(2nd ...” February 16, 2019 Jay@ManhattanReview posted a reply to The inside of a rectangular carton is 48 centimeters long, 3 in the Data Sufficiency forum “Let''s take each statement one by one. (1) Each of the cans has a radius of 4 centimeters. Thus, the diameter of each can = 8 cm and 48/8 = 6 cans can fit in a row; similarly, 32/8 = 4 cans can fit in a column. Thus, k = 6*4 = 24. Sufficient. (2) Six of the cans fit exactly along the ...” February 16, 2019 Rich.C@EMPOWERgmat.com posted a reply to Working at their individual same constant rate, 24 machines in the Problem Solving forum “Hi All, We''re told that while working at their individual same constant rate, 24 machines can complete a certain production job in 10 hours when they all work together. However, on a certain day, due to minor malfunction, 8 of those machines were not operating for the first 2 hours. We''re ...” February 15, 2019 Rich.C@EMPOWERgmat.com posted a reply to If a positive integer q is divisible by both 3 and 11, then in the Problem Solving forum “Hi All, We''re told that Q is a positive integer that is divisible by BOTH 3 and 11. We''re asked which of the following MUST also divisible evenly into Q. This question can be approached in a couple of different ways, including by TESTing VALUES. With these types of prompts, it often helps ...” February 15, 2019 Brent@GMATPrepNow posted a reply to If a positive integer q is divisible by both 3 and 11, then in the Problem Solving forum “I. 14 14 is NOT divisible by 3 or 11 So, statement I is NOT true. ELIMINATE A and D III. 66 Integer q COULD equal 33 (which is divisible by 3 and 11) Since 33 is NOT divisible by 66, statement III is NOT true. ELIMINATE C and E By the process of elimination, the correct answer is B ...” February 15, 2019 Brent@GMATPrepNow posted a reply to Kevin buys beer in bottles and cans. He pays$1.00 for each in the Data Sufficiency forum
“Target question: How many bottles of beer did Kevin buy? Given: Kevin pays $1.00 for each can of beer and$1.50 for each bottle of beer. Kevin buys a total of 15 bottles and cans of beer Let C = the NUMBER of Cans that Kevin bought Let B = the NUMBER of Bottles that Kevin bought So, we can ...”
February 15, 2019
Jay@ManhattanReview posted a reply to Derek's cell phone bill shows total minutes used for each of in the Data Sufficiency forum
“Given: Derek''s cell phone bill shows total minutes used for each of two categories: peak minutes and off-peak minutes. Derek used a total of 75 minutes last month. We have to determine the number of off-peak minutes he used. Let''s take each statement one by one. 1) Derek used twice as ...”
February 15, 2019
Jay@ManhattanReview posted a reply to Set S consists of all the positive multiples of 5 that are l in the Data Sufficiency forum
“Given: 1. Set S consists of all the positive multiples of 5 such that they are less than K, and K is a positive integer not divisible by 5. For example say, K = 21, then set S:{ 5, 10, 15, 20}; however, if say K = 52, then set S:{ 5, 10, 15, 20, 25, 30, 35, 40, 45, 50} 2. The mean of Set S ...”
February 15, 2019
Jay@ManhattanReview posted a reply to A certain military vehicle can run on pure Fuel X, pure Fuel in the Data Sufficiency forum
“Say there be x gallons of fuel X, and y gallons of fuel Y in the tank. Cost per gallon = (3x + 5y)/(x + y) We have to get the value of (3x + 5y)/(x + y). Let''s take each statement one by one. (1) Using fuel currently in its tank, the vehicle burned 8 gallons to cover 200 miles. => ...”
February 15, 2019
Brent@GMATPrepNow posted a reply to A group of x people is practicing levitation yoga. One-fourt in the Problem Solving forum
“ One-fourth of the people rise up in the air If 1/4 of the x people are in the AIR, the remaining 3/4 of the x people are on the GROUND So, (3/4)x = number of people on the GROUND After a while, 3 of them come back down. So, the number of people on the GROUND is increased by 3 So, now ...”
February 14, 2019
Brent@GMATPrepNow posted a reply to In the figure above, polygon N has been partially covered by in the Data Sufficiency forum
“Target question: How many sides does N have? Statement 1: x + y = 45 Since all angles in a triangle add to 180°, we know that the missing angle is 135° https://i.imgur.com/oUCDRTN.png There are plenty of polygons that have at least one angle measuring 135°. Here are two: Case a: ...”
February 14, 2019
Brent@GMATPrepNow posted a reply to Which of the following expressions is equal to 2^32-2^31-2^3 in the Problem Solving forum
“2^32 - 2^31 - 2^30 = (2^30)(2^2 - 2^1 - 1) = (2^30)(4 - 2 - 1) = (2^30)(1) = 2^30 Answer: C Cheers, Brent”
February 14, 2019
Jay@ManhattanReview posted a reply to For how many integer values of m is x < m < y ? (1) x in the Data Sufficiency forum
“Given: x < m < y We have to determine how many integer values of m exist. Let''s take each statement one by one. (1) x and y are positive integers. Certainly insufficient. (2) y – x = 6 Case 1: Say y = 10.5 and x = 4.5, then m = {10, 9, 8, 7, 6, 5, 4}; there are a total of ...”
February 14, 2019
Brent@GMATPrepNow posted a reply to OG L-shaped garden in the Data Sufficiency forum
“Target question: What is the value of k? Statement 1: The area of the garden is 189 square feet. Let''s drawn an auxiliary line that divides the shape into two rectangular regions A and B. https://i.imgur.com/hJBOxsO.png Regions A and B have the following measurements. ...”
February 13, 2019
Brent@GMATPrepNow posted a reply to How many integers between 18 and 3399 are multiples of 17? in the Problem Solving forum
“Let''s list the multiples of 17 that are between 18 and 3399 : 34 = 2(17) 51 = 3(17) 68 = 4(17) 85 = 5(17) . . . 3383 = 199(17) So, the number of multiples of 17 is EQUAL to the number of integers from 2 to 199 inclusive ASIDE: A nice rule says: the number of integers from x to y ...”
February 13, 2019
Brent@GMATPrepNow posted a reply to A mountain resort will hold its annual one-day snowboarding in the Problem Solving forum
“GIVEN: P(snow) = 0.7, so P(no snow) = 0.3 Let''s use the complement to solve this. That is, P(event is held) = 1 - P(event is NOT held) P(event is NOT held) = P(no snow on Saturday AND no snow on Sunday) = P(no snow on Saturday) x P(no snow on Sunday) = 0.3 x 0.3 = 0.09 So, P(event is ...”
February 13, 2019
Jay@ManhattanReview posted a reply to Is $$a^3 + b^2 + 4$$ divisible by 6? in the Data Sufficiency forum
“For a^3 + b^2 + 4 to be divisible by 6, it must be divisible by 2 as well as 3. Thus, a^3 + b^2 + 4 must be even. Let''s take each statement one by one. (I) b is odd If a is even, then a^3 is even and b^2 is odd; thus, a^3 + b^2 + 4 is odd. The answer is no. If a is odd, say a = b = 1, ...”
February 13, 2019
Jay@ManhattanReview posted a reply to In a certain senior class, 72 percent of the male students in the Data Sufficiency forum
“Say there are x numbers of male and y numbers of female students. Thus, we have # of students who have students have applied to college = 72% of x + 80% of y = 0.72x + 0.80y We have to get the value of x/(x + y). Let''s take each statement one by one. 1) There are 840 students in the ...”
February 13, 2019
Jay@ManhattanReview posted a reply to If a, b, c, d are 4 non-negative integers. Is (a+c) even? in the Data Sufficiency forum
“Given: a, b, c, d are 4 non-negative integers. We have to determine whether (a + c) is even. Let''s take each statement one by one. (1) a^2 + b^2 + c^2 is even. Case 1: Say a = 0; b = c = 1, then we have a^2 + b^2 + c^2 = 0^2 + 1^2 + 1^2 = 2, an even number. However, a + c = 0 + 1 = 1, ...”
February 13, 2019
Brent@GMATPrepNow posted a reply to The product P of two prime numbers is between 9 and 55. in the Problem Solving forum
“Prime numbers that are greater than 2 but less than 6: 3, 5 Prime numbers that are greater than 13 but less than 25: 17, 19, 23 Scan the answer choices . . . E) 51 = 3 x 17 PERFECT! Answer: E Cheers, Brent”
February 12, 2019
Brent@GMATPrepNow posted a reply to What is the probability that you get a pair when picking the in the Problem Solving forum
“P(select pair) = P(1st card is ANY card AND 2nd card matches 1st card) = P(1st card is ANY card) x P(2nd card matches 1st card) = 1 x 3/51 = 3/51 = 1/17 = C Aside: P(2nd card matches 1st card) = 3/51, because once 1 card is selected, there are 51 cards remaining in the deck. Among those 51 ...”
February 12, 2019
Brent@GMATPrepNow posted a reply to At her current job, Mary gets a 1.5% raise twice per year. in the Problem Solving forum
“One approach here is to apply the COMPOUND INTEREST formula. However, if you didn''t see that the question is analogous to a COMPOUND INTEREST question, we can also solve the question by looking for a pattern. Let''s try that: Time elapsed (in years) | salary 0 | s 0.5 | (1.015)(s) 1 | ...”
February 12, 2019
Brent@GMATPrepNow posted a reply to Of the 3,000 cars manufactured in Factory Q last year, how in the Data Sufficiency forum
“Target question: Of the 3,000 cars manufactured in Factory Q LAST YEAR, how many were still in operation at the end of the year? Neither statement provides any information about the cars manufactured LAST YEAR. Instead, we''re told about ALL of the cars ever manufactured . As such, the ...”
February 12, 2019
Brent@GMATPrepNow posted a reply to In the figure given, x = 3(y-z). What is the value of x? in the Problem Solving forum
“Since angles on a LINE add to 180°, . . . https://i.imgur.com/kAdhC7N.png . . . we know that x + z = 180 Subtract x from both sides to get: z = 180 - x Since angles in a CIRCLE add to 360°. . . https://i.imgur.com/l1SKqw5.png . . . we know that 60 + (180 - x) + y = 360 Simplify left ...”
February 12, 2019
Brent@GMATPrepNow posted a reply to In the xy-coordinate plane, if the point (0,2) lies on the g in the Problem Solving forum
“KEY CONCEPT: In order for a point to be ON a line, the x- and y-coordinates of the point must satisfy the equation of that line So, for example, the point (3,7) lies ON the line defined by the equation y = 2x + 1, because x = 3 and y = 7 satisfy the equation y = 2x + 1 That is, 7 = 2(3) + 1 ...”
February 12, 2019
Brent@GMATPrepNow posted a reply to Set S consists of n consecutive integers, where n > 1. in the Data Sufficiency forum
“ Given: Set S consists of n consecutive integers, where n > 1. Target question: What is the value of n? IMPORTANT: Notice that the two statements are VERY SIMILAR. That is, if the sum of the values is 14 (statement 2), then it is guaranteed that the sum is divisible by 7 (statement 1). ...”
February 12, 2019
Jay@ManhattanReview posted a reply to Square ABCD has an area of 9 square inches. Sides AD and BC in the Data Sufficiency forum
“Given that the square ABCD has an area of 9 square inches, we have AD = BC = 3 inches. Thus, the increased length of AD and BC is AD'' and BC'' = (3 + x) inches. We have to determine the value of x. Let''s take each statement one by one. (1) The diagonal of the resulting rectangle measures ...”
February 12, 2019
Jay@ManhattanReview posted a reply to The table above shows the morning schedule for train X. in the Data Sufficiency forum
“Let''s take each statement one by one. 1) Juan arrived at station T on Monday morning 1 hour and 2 minutes after he left station S. Case 1: If John started from station S at 7:08, he arrived at station T at 8:10, scheduled time. The answer is yes. Case 2: If John started late from station S ...”
February 12, 2019
Jay@ManhattanReview posted a reply to If n is a positive integer and r is the remainder when (n-1) in the Data Sufficiency forum
“We have to determine whether (n – 1)(n + 1) is divided by 24. Let''s take each statement one by one. 1) n is not divisible by 2. => n is an odd number. Thus, (n – 1) and (n + 1) are even. Note that at least one between (n – 1) and (n + 1) must be divisible by 4, thus, (n – 1)*(n ...”
February 12, 2019
Brent@GMATPrepNow posted a reply to A computer chip manufacturer expects the ratio of the number in the Problem Solving forum
“Let''s find some TOTALS for all 4 shipments combined. There are 51,000 chips altogether There are 17 defective chips altogether. So, 17/51000 of the chips are defective. (notice that 17 divides nicely into 51000!) SIMPLIFY: 1/3000 of the chips are defective So, if we have a shipment of ...”
February 11, 2019
Brent@GMATPrepNow posted a reply to If O is the center of the circle with diameter AB and T is a in the Problem Solving forum
“Since angles in a triangle add to 180°, we know that the missing angle = (90 - 2x)° https://i.imgur.com/FcSiZi2.png Aside: Notice that (90 - 2x)° + 90° + 2x° =180° Since angles on a line add to 180°, we know that the missing angle = (90 + 2x)° https://i.imgur.com/9Z5ULFo.png ...”
February 11, 2019
Brent@GMATPrepNow posted a reply to tough geo. problem in the Data Sufficiency forum
“Target question: What is the length of side BC? Statement 1: Line segment AD has length 6. BEFORE we deal with statement 1, let''s see what information we can add to the diagram. For example, since ∆BDC has 2 equal angles (of 2x°), we know that side BD = side BC: ...”
February 11, 2019
Brent@GMATPrepNow posted a reply to What is the area of a right triangle? in the Data Sufficiency forum
“Target question: What is the area of a right triangle? Statement 1: The length of one side is 3 Knowing the length of only 1 side will not help us answer the target question with certainty. Statement 1 is NOT SUFFICIENT Statement 2: The length of one side is 4 NOT SUFFICIENT (same ...”
February 11, 2019
Brent@GMATPrepNow posted a reply to If x=0.2, then what is the value of x^3-1/x-1? in the Problem Solving forum
“Some spaces and/or brackets would definitely help here. Do you mean x^3 - 1/x - 1 or x^3 - 1/(x - 1) or (x^3 - 1)/(x - 1)?? Cheers, Brent”
February 11, 2019
Brent@GMATPrepNow posted a reply to If n and p are integers, is p > 0? in the Data Sufficiency forum
“ Given: n and p are integers Target question: Is p > 0? Statement 1: n + 1 > 0 No information about p. Statement 1 is NOT SUFFICIENT Statement 2: np > 0 There are several values of n and p that satisfy statement 2. Here are two: Case a: n = 1 and p = 1. In this case, ...”
February 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to During the four years that Mrs. Lopez owned her car, she fou in the Problem Solving forum
“Hi All, We''re told that during the 4 years that Mrs. Lopez owned her car, she found that her total car expenses were $18,000. Fuel and maintenance costs accounted for 1/3 of the total and depreciation accounted for 3/5 of the REMAINDER. The cost of insurance was 3 times the cost of financing, ...” February 10, 2019 Rich.C@EMPOWERgmat.com posted a reply to At Megalomania Industries, factory workers were paid$20 per in the Problem Solving forum
“Hi All, We''re told that at Megalomania Industries, factory workers were paid $20 per hour in 1990 and$10 per hour in 2000 and the CEO of Megalomania Industries was paid $5 million per year in 1990 and$50 million per year in 2000. We''re asked for what percent greater was the percent increase ...”
February 10, 2019
Rich.C@EMPOWERgmat.com posted a reply to A company’s four cars running 10 hrs a day consume 1200 lt in the Problem Solving forum
“Hi All, We''re told that a company’s 4 cars running 10 hrs a day consume 1200 liters of fuel in 10 days. In the next 6 days, the company will need to run 9 cars for 12 hrs each so it rents 5 more cars which consume 20% less fuel than the company’s four cars. We''re asked for the number of ...”
February 10, 2019
Brent@GMATPrepNow posted a reply to If x and y are integers, is x^2-y^2 odd? in the Data Sufficiency forum
“Some important rules: #1. ODD +/- ODD = EVEN #2. ODD +/- EVEN = ODD #3. EVEN +/- EVEN = EVEN #4. (ODD)(ODD) = ODD #5. (ODD)(EVEN) = EVEN #6. (EVEN)(EVEN) = EVEN Target question: Is x² - y² odd? IMPORTANT: Notice that we can factor x² - y² to get: x² - y² = (x + y)(x - y) ...”
February 10, 2019
Brent@GMATPrepNow posted a reply to In a group of 100 adults, 75 percent of the women are in the Problem Solving forum
“GIVEN: 75% women are LEFT handed This also tells us that 25% women are RIGHT handed GIVEN: There are 12 right-handed women Let W = total number of women in the group So, 25% of W = 12 Rewrite as: 0.25W = 12 Solve: W = 12/0.25 = 48 So, there are 48 women So, the number of men in the ...”
February 10, 2019
Jay@ManhattanReview posted a reply to The figure above shows the railway tracks between three in the Problem Solving forum
“Route of the train from A to B: ACB = AC + CB = 240 + √(100^2 + 240^2) = 240 + 260 = 500 km Route of the train from A to B: BCA = ACB = BC + CA = 500 km Since from the scheduled time of their departure, 9 am, the train from A starts 1/2 an hour early (8:30 am) and train B starts 1/2 and later ...”
February 10, 2019
Brent@GMATPrepNow posted a reply to Triangle XYZ is an isosceles right triangle. If side XY is l in the Problem Solving forum
“Triangle XYZ is an isosceles right triangle. Let''s sketch an isosceles right triangle: https://i.imgur.com/N3UOppf.png Side XY is longer than side YZ Since the hypotenuse is the longest side of a right triangle, side XY must be the hypotenuse. Add this to our diagram: ...”
February 9, 2019
Rich.C@EMPOWERgmat.com posted a reply to 530 to 700 in 3 months- possible? best strategy/study plan? in the GMAT Strategy forum
“Hi mgec0424, To start, a 520 is a decent initial CAT Score (the average Score on the Official GMAT hovers around 550 most years). Scoring 530 on your second CAT isn''t necessary a ''bad'' thing either - since it takes time to properly use what you''ve learn and adapt your approach to the overall ...”
February 8, 2019
Brent@GMATPrepNow posted a reply to Out of 2 broken TV sets and 6 fixed TV sets in Joe's Fix-My- in the Problem Solving forum
“There are 8 TV''s in total 2 are broken 6 are fixed We want to find P(at least one TV is broken) When it comes to probability questions involving at least, it''s often best to try using the complement. That is, P(Event A happening) = 1 - P(Event A not happening) So, here we get: P(getting ...”
February 8, 2019
Brent@GMATPrepNow posted a reply to An electrical supplies store sells 140 power stabilizer in the Problem Solving forum
“Let x = the selling price per unit So, x - 16 = the PROFIT on ONE unit And 140(x - 16) = the PROFIT on the sale of 140 units (aka the weekly profit) What is the minimum selling price per unit that will ensure a weekly profit of at least $5600 from sales of power stabilizers? In other words, ...” February 8, 2019 Brent@GMATPrepNow posted a reply to What is the remainder when the positive integer n is divided in the Data Sufficiency forum “Target question: What is the remainder when the positive integer n is divided by 6? Statement 1: n is multiple of 5 Let''s TEST some values. There are several values of n that satisfy statement 1. Here are two: Case a: n = 10. In this case, the answer to the target question is the ...” February 8, 2019 Jay@ManhattanReview posted a reply to In the xy coordinate plane, line L and line K intersect at in the Data Sufficiency forum “Say the equations of line L and K are y = m1*x + c1; eqn of line L; y = m2*x + c2; eqn of line K Here, m1 and m2 are slopes of line L and line K; and c1 and c2 are y-intercepts of line L and line K. We have to determine whether m1*m2 < 0. Let''s take each statement one by one. 1) ...” February 8, 2019 Brent@GMATPrepNow posted a reply to What is the sum of the digits of the number (2^{2018})(5^{20 in the Problem Solving forum “Useful rule: (x^k)(y^k) = (xy)^k Example: (3^4)(7^4) = 21^4 (2^2018)(5^2019)(3^2) = (2^2018)((5^2018)(5^1))(3^2) = (2^2018)(5^2018)(5^1))(3^2) = (10^2018)(5^1))(3^2) = (10^2018)(5)(9) = (10^2018)(45) We know that (10^2018) = 1 followed by 2018 zeros So, (10^2018)(45) = 45 followed by ...” February 7, 2019 Brent@GMATPrepNow posted a reply to If a and b are integers, is a + b + 3 an odd integer? (1) in the Data Sufficiency forum “Target question: Is a + b + 3 an odd integer? Given: a and b are integers Statement 1: ab is an odd integer. Some useful rules: 1. ODD - ODD = EVEN 2. ODD - EVEN = ODD 3. EVEN - ODD = ODD 4. EVEN - EVEN = EVEN 5. (ODD)(ODD) = ODD 6. (ODD)(EVEN) = EVEN 7. (EVEN)(EVEN) = EVEN ...” February 7, 2019 Brent@GMATPrepNow posted a reply to The sides of a right triangle are consecutive even integers, in the Problem Solving forum “GIVEN: p = length of the longest side Since the side lengths are consecutive even integers, we can say: p - 2 = length of the 2nd longest side p - 4 = length of the shortest side NOTE: The longest side is the HYPOTENUSE. So, p = length of the HYPOTENUSE And p - 2 = length of one leg of ...” February 7, 2019 Brent@GMATPrepNow posted a reply to In the diagram above, O is the center of the circle. What is in the Data Sufficiency forum “Target question: What is the length of chord AC? Given: O is the center of the circle If O is the center of the circle, then AB is the circle''s DIAMETER If AB is the DIAMETER, then ∠C = 90°, because ∠C is an inscribed angle containing ("holding") the diameter. So, let''s ...” February 7, 2019 Rich.C@EMPOWERgmat.com posted a reply to Ten telegenic contestants with a variety of personality diso in the Problem Solving forum “Hi All, For Test Takers who know the Combination Formula, this question is a fairly straight-forward prompt. If you DON''T know the Combination Formula though, then here''s what it is and how to use it. Any time a prompt asks for "groups" or "combinations" of things, then the ...” February 7, 2019 Rich.C@EMPOWERgmat.com posted a reply to The sides of a right triangle are consecutive even integers, in the Problem Solving forum “Hi All, We''re told that the sides of a right triangle are CONSECUTIVE EVEN INTEGERS, and the length of the LONGEST side is P. We''re asked which of the following equations could be used to find P. This question can be solved in a couple of different ways, including by TESTing VALUES. To ...” February 7, 2019 Rich.C@EMPOWERgmat.com posted a reply to There are 13 hearts in a full deck of 52 cards. In a certain in the Problem Solving forum “Hi All, The probability of pulling a heart out of a full deck of cards is 13/52 = 1/4, so the probability of NOT pulling a heart out of a full deck = 1 - 1/4 = 3/4. The probability of pulling a heart on the THIRD try, and NOT pulling a heart on the first two tries is: (3/4)(3/4)(1/4) = ...” February 7, 2019 Brent@GMATPrepNow posted a reply to Ten telegenic contestants with a variety of personality diso in the Problem Solving forum “Let''s take the task of creating the teams and break it into stages. Stage 1: Select two 5 contestants to be in tribe A Since the order in which we select the contestants does not matter, we can use combinations. We can select 5 contestants from 10 contestants in 10C5 ways 10C5 = ...” February 7, 2019 Jay@ManhattanReview posted a reply to At a farmers market, a florist sells only roses, and in the Data Sufficiency forum “Say he sold x numbers of individual roses and y numbers of bouquets of one dozen roses. Thus, the total number of roses sold = x + 12y. Given: Total sales = 2x + 19y We have to get the value of x + 12y. Let''s take each statement one by one. 1) The florist made$190. 2x + 19y = ...”
February 7, 2019
Jay@ManhattanReview posted a reply to A box contains red and blue balls only. If there are 8 balls in the Data Sufficiency forum
“We have to determine the number of red balls. Say the number of red balls is r; thus, the number of blue balls = 8 – r. Let''s take each statement one by one. (1) If two balls are randomly selected without replacement, the probability that both balls are red is 5/14 => rC2 / 8C2 = ...”
February 7, 2019
Jay@ManhattanReview posted a reply to Samantha investes i1 dollars in bond X, which pays r1 in the Data Sufficiency forum
“Simple interest earned on the first investment = i1*r1*1/100 =i1*r1/100; Simple interest earned on the second investment = i2*r2*1/100 =i2*r2/100; We have to determine whether i1*r1/100 > i2*r2/100, or i1*r1 > i2*r2. Let''s take each statement one by one. 1) (r1)^2 > (r2)^2. ...”
February 7, 2019
Jay@ManhattanReview posted a reply to A manufacturer produced x percent more video cameras in 1994 in the Data Sufficiency forum
“Given: # of video cameras produced in 1993 = 1000 Thus, # of video cameras produced in 1994 = 1000 + x% of 1000 = 1000(1 + x%) = 1000(1 + x/100); # of video cameras produced in 1995 = 1000(1 + x/100)(1 + y%) = 1000(1 + x/100)(1 + y/100) = 1000(1 + x/100 + y/100 + xy/10000) = 1000B Hope ...”
February 7, 2019
Rich.C@EMPOWERgmat.com posted a reply to Starting with 0, a mathematician labels every non-negative i in the Problem Solving forum
“Hi All, We''re told that starting with 0, a mathematician labels every non-negative integer as one of five types: alpha, beta, gamma, delta, or epsilon, in that repeating order as the integers increase. For instance, the integer 8 is labeled delta. We''re asked for the label on an integer that ...”
February 7, 2019
Brent@GMATPrepNow posted a reply to We define the harmonic mean of a set of numbers as the recip in the Problem Solving forum
“What is the harmonic mean of 20 and 30? NOTE: 20 = 20/1 So, the reciprocal of 20 = 1/20 And the reciprocal of 30 = 1/30 The average of 1/20 and 1/30 = (1/20 + 1/30 )/2 = (3/60 + 2/60 )/2 = (5/60 )/2 = (5/60 )/(2/1) = (5/60 )(1/2) = 5/120 The reciprocal of 5/120 = 120/5 = 24 Answer: ...”
February 6, 2019
Brent@GMATPrepNow posted a reply to A certain bag contains red, blue, and green marbles. What is in the Data Sufficiency forum
“ Given: A certain bag contains red, blue, and green marbles. Let R = # number red marbles in the bag Let B = # number blue marbles in the bag Let G = # number green marbles in the bag Target question: What is the value of G/R? Statement 1: The number of blue marbles in the bag is two ...”
February 6, 2019
Brent@GMATPrepNow posted a reply to If x is a nonzero number, which of the three numbers x, 1/x in the Data Sufficiency forum
“ Given: x is a nonzero number Target question: Which of the three numbers x, 1/x and x² is greatest? Statement 1: -1 < x < 1 This statement doesn''t FEEL sufficient, so I''ll TEST some values. There are several values of x that satisfy statement 1. Here are two: Case a: x = ...”
February 6, 2019
Jay@ManhattanReview posted a reply to A set of 11 positive integers have an average of 25. Which in the Problem Solving forum
“Given the average of 11 positive integers is 25, we have the sum of the 11 positive integers = 11*25 = 275. Again, given that there are 11 numbers in the set, the median would be the 6th number. Since we need to maximize the median, we must have the values of 1st to 5th numbers smallest. The ...”
February 6, 2019
Jay@ManhattanReview posted a reply to A vendor sells specialty gift basket at a price of $50.00 in the Problem Solving forum “Given that the vendor marks up 25% above the cost, the cost per basket = 50 / (100 + 25)% =$40; Selling price per basket to make 20% profit = 40 + 20% of 40 = $48. Thus, the vendor can return (50 – 48)*120 =$240 for 15 baksets => The vendor should refund 240/15 = $16 per basket so ...” February 6, 2019 Jay@ManhattanReview posted a reply to X is a three-digit positive integer in which each digit is e in the Data Sufficiency forum “This can be solved efficiently with some hit and trial approach. Let''s take each statement one by one. (1) The hundreds digit of XY is 6. Given that the hundreds digit of XY is 6, we can have two cases: 1. (X, Y):(121, 121) and 2. (X, Y):(112, 112). In each case, the remainder when X is ...” February 6, 2019 Jay@ManhattanReview posted a reply to X is a three-digit positive integer in which each digit is e in the Data Sufficiency forum “This can be solved efficiently with some hit and trial approach. Let''s take each statement one by one. (1) The hundreds digit of XY is 6. Given that the hundreds digit of XY is 6, we can have two cases: 1. (X, Y):(121, 121) and 2. (X, Y):(112, 112). In each case, the remainder when X is ...” February 6, 2019 Jay@ManhattanReview posted a reply to Of the N candies in a bag, some are peppermint and the rest in the Data Sufficiency forum “Say there are P numbers of peppermints and S numbers of spearmints. Thus, we have P + S = N. We have to get the value of N. Let''s take each statement one by one. 1) If 1 peppermint candy was removed from the N candies, 1/5 of the remaining candies would be peppermint. => P – 1 = ...” February 6, 2019 Rich.C@EMPOWERgmat.com posted a reply to Three digits have been removed from each of the following in the Problem Solving forum “Hi All, We''re told that three digits have been removed from each of the following numbers and n = 25. We''re asked which of the numbers is equal to 3*2^(n-1). To start, the fact that three digits have been removed from each answer is irrelevant. When a GMAT question presents information ...” February 5, 2019 Rich.C@EMPOWERgmat.com posted a reply to The organizers of a conference offered a certain number of s in the Problem Solving forum “Hi All, We''re told that the organizers of a conference offered a certain number of simultaneous seminars with the intention that each seminar would be attended by 18 conference attendees. However, space limitations allowed only up to 15 conference attendees to participate in each of a number of ...” February 5, 2019 Rich.C@EMPOWERgmat.com posted a reply to At a school-wide athletic fair, five students won a combined in the Problem Solving forum “Hi All, We''re told that at a school-wide athletic fair, five students won a combined total of 20 ribbons, each of the five students won AT LEAST one ribbon and NO two students won the SAME number of ribbons. We''re asked for the greatest number of ribbons that the student with the ...” February 5, 2019 Rich.C@EMPOWERgmat.com posted a reply to In how many ways can a 4-letter word be formed from the in the Problem Solving forum “Hi regor60, I agree that this prompt is poorly-worded. The "intent" is to ask for every 4-letter arrangement that fits the given restrictions, INCLUDING "words" that do not appear in the dictionary (re: arrangements that are not actually words). GMAT question-writers are far ...” February 5, 2019 Rich.C@EMPOWERgmat.com posted a reply to In the coordinate plane, Line A has a slope of -1 and an in the Problem Solving forum “Hi All, We''re told that in the coordinate plane, Line A has a slope of -1 and an x-intercept of 1 and Line B has a slope of 2 and a y-intercept of -2. The two lines intersect at the point (a,b). We''re asked for the sum a and b. When dealing with lines, it often helps to write the given ...” February 5, 2019 Brent@GMATPrepNow posted a reply to Three sisters have an average (arithmetic mean) age of 25 in the Problem Solving forum “If the average age is 25, we can write: (sum of all 3 ages)/3 = 25 This means, the sum of all 3 ages = 75 If the median is 24, then we can express the ages in ascending order as follows: __ , 24, __ Since the sum of the ages is 75, we can MINIMIZE the age of the oldest girl by MAXIMIZING the ...” February 5, 2019 Brent@GMATPrepNow posted a reply to A contractor combined x tons of a gravel mixture that in the Data Sufficiency forum “Let''s use some weighted averages to solve this question Weighted average of groups combined = (group A proportion)(group A average) + (group B proportion)(group B average) + (group C proportion)(group C average) + ... Target question: What is the value of x ? Given: A contractor combined x ...” February 4, 2019 Rich.C@EMPOWERgmat.com posted a reply to Work/Rate problem in the Problem Solving forum “Hi benjemin28, It''s worth noting that he Quant section of the GMAT is NOT a ''math test'' - it''s a ''critical thinking test'' that requires lots of little calculations as you work through it. Most GMAT questions are designed so that they can be solved in more than one way (and certain Tactics ...” February 4, 2019 Rich.C@EMPOWERgmat.com posted a reply to In a certain sock drawer, there are 4 pairs of black socks, in the Problem Solving forum “Hi All, The concept in these types of questions is based on the ''worst case scenario'' - to guarantee that something will happen, you have to focus on the ''extreme/longest'' way that it could happen. Here, we have 4 black socks, 3 gray socks and 2 orange socks. The question asks for the ...” February 4, 2019 Rich.C@EMPOWERgmat.com posted a reply to The original price of a certain TV set is discounted by x in the Problem Solving forum “Hi All, We''re told that the original price of a certain TV set is discounted by X percent, the reduced price is then discounted by 2X percent and P is the original price of the TV set. We''re asked which of the following represents the price of the television set after the two successive ...” February 4, 2019 Brent@GMATPrepNow posted a reply to A committee of 6 is chosen from 8 men and 5 women so as to in the Problem Solving forum “Since the committee must have 6 people, there are two cases that meet the given restrictions: 1) The committee has 2 men and 4 women 2) The committee has 3 men and 3 women 1) The committee has 2 men and 4 women Since the order in which we select the men and women does not matter, we can use ...” February 4, 2019 Brent@GMATPrepNow posted a reply to Mixture problem unclear in the Problem Solving forum “When solving mixture questions, I find it useful to sketch the solutions with the ingredients SEPARATED. Since we''re asked to find a PERCENTAGE, we can assign a "nice" value to the original volume. So, let''s say we start with 100 liters https://i.imgur.com/yt2KAw7.png As you can ...” February 4, 2019 Brent@GMATPrepNow posted a reply to Mr. Jones spends$25 on movie tickets for a party of adults in the Data Sufficiency forum
“ Given: Mr. Jones spends $25 on movie tickets for a party of adults and children. Target question: How many children''s tickets did he buy? Statement 1: Adult movie tickets cost$3 each and children''s tickets cost $2 each. There are several scenarios that satisfy statement 1. Here are ...” February 4, 2019 Brent@GMATPrepNow posted a reply to In a certain sock drawer, there are 4 pairs of black socks, in the Problem Solving forum “If we remove 1 black sock, 1 gray sock, and 1 orange sock, then we still don''t have a matching sock. So, we can select 3 socks WITHOUT having a matching pair. However, if we pick ANY sock for our fourth sock, that sock MUST match one of the first 3 socks selected. Answer: A Cheers, Brent” February 4, 2019 Jay@ManhattanReview posted a reply to In a certain sock drawer, there are 4 pairs of black socks, in the Problem Solving forum “It''s already answered at the BTG. Pl. find it here: https://www.beatthegmat.com/probability-t99931.html Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Austin | GMAT Tutoring Denver | GRE Prep Los Angeles | TOEFL Prep Classes Las Vegas | and ...” February 4, 2019 Jay@ManhattanReview posted a reply to The perimeter of a rectangular garden is 360 ft. What is the in the Data Sufficiency forum “Perimeter of a rectangular garden = 2(a + b) = 360; where a = length and b = width We have to determine the value of a. Let''s take each statement one by one. 1) The length of the garden is twice the width. => a = 2b Thus, from 2(a + b) = 360 and a = 2b, we have 2(2b + b) = 360 ...” February 4, 2019 Jay@ManhattanReview posted a reply to Is triangle ABC obtuse angled? (1) a^2 + b^2 > c^2 (2) in the Data Sufficiency forum “It''s already replied at the BTG> Here it is https://www.beatthegmat.com/is-triangle-abc-obtuse-angled-t305338.html Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Austin | GMAT Tutoring Denver | GRE Prep Los Angeles | TOEFL Prep Classes Las ...” February 4, 2019 Jay@ManhattanReview posted a reply to If x, y, and z are different positive integers, is x prime? in the Data Sufficiency forum “Given: x, y, and z are different positive integers. We have to determine whether x is prime. Let''s take each statement one by one. (1) xyz = 30 Factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. Case 1: Say xyz = 30 = 1*2*15; x = 1 is non-prime. Case 2: Say xyz = 30 = 2*1*15; x = 2 is ...” February 4, 2019 February 4, 2019 Brent@GMATPrepNow posted a reply to Piper bought three shirts. The three shirts cost$210 in the Data Sufficiency forum
“IMPORTANT: Notice that statements 1 and 2 provide the EXACT SAME INFORMATION. When this occurs, the correct answer is either D or E Since the information is so sparse, I have a feeling that the correct answer is E. So, I''m going to try to find two possible cases that satisfy both statements, yet ...”
February 3, 2019
Brent@GMATPrepNow posted a reply to In the graduating class of a certain college, 48 percent of in the Problem Solving forum
“I thought I''d point out that Mitch''s Double Matrix Method approach can be used for most questions featuring a population in which each member has two characteristics associated with it. Here, we have a population of students, and the two characteristics are: - male or female - younger than 25 ...”
February 3, 2019
Brent@GMATPrepNow posted a reply to Bite-sized video lessons from GMAT Prep Now in the GMAT Math forum
“Data Sufficiency lesson #3: Avoiding Common Mistakes - Part I Video : https://www.youtube.com/watch?v=iACq36scVYQ Cheers, Brent”
February 3, 2019
Rich.C@EMPOWERgmat.com posted a reply to The value of (10^8-10^2)/(10^7-10^3) is closest to which in the Problem Solving forum
“Hi All, We''re asked to choose the answer that is CLOSEST in value to (10^8-10^2)/(10^7-10^3). While you might be tempted to try lots of ''math steps'', if you consider how the answer choices are written, you can use a bit of estimation and logic to get to the correct answer without doing too ...”
February 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to A company produces baseball cards in equal numbers of regula in the Problem Solving forum
“Hi All, We''re told that a company produces baseball cards in EQUAL numbers of regular packs of 16 and deluxe packs of 30. On a certain day, the company produces 241 cards. We''re asked for the SMALLEST number of additional cards the company needs to produce in order to maintain its regular ...”
February 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to If the probability of rain on any given day is 50%, what is in the Problem Solving forum
“Hi All, We''re told that the probability of rain on any given day is 50%. We''re asked for the probability that it will rain on AT LEAST three days in a ROW during a five-day period. This question can be approached in a number of different ways; you might find it easiest to do a little math and ...”
February 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to Father John forms a choir from the church attendants. in the Problem Solving forum
“Hi All, We''re told that Father John forms a choir from the church attendants. 30 people attend John''s church and the choir has 28 spots available, with one person as the lead singer. We''re asked for the number of different combinations for the choir. This question involves the Combination ...”
February 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to A scriptwriter charges $4 for every standard script, which in the Problem Solving forum “Hi All, We''re told that a scriptwriter has a particular series of fees for a script (based on the length of the script). The scriptwriter charges.... 1)$4 for every standard script, which is 4 pages or shorter in length 2) 50 cents for every additional page 3) NO CHARGE for every 11th ...”
February 2, 2019
ceilidh.erickson posted a reply to If x and y are positive integers, what is the remainder when in the Data Sufficiency forum
“If x and y are positive integers, what is the remainder when 5^x is divided by y? In order to answer this question, we need some information about x and y. For some divisors of y, the value of x wouldn''t matter: if y = 5, the remainder is always 0, because any 5^x will be divisible by 5. If y = ...”
February 2, 2019
ceilidh.erickson posted a reply to On the number line, the distance between point A and point C in the Data Sufficiency forum
“With NUMBER LINE problems in DS, remember that information about distance alone does not give us information about direction. When unpacking the question, try to imagine different scenarios with the given information. Try to come up with one scenario in which C is between A and B, and one in ...”
February 2, 2019
ceilidh.erickson posted a reply to Beth has a collection of 8 boxes of clothing for a charity, in the Problem Solving forum
“When there are variables in the answer choices in a PS problem, it''s often easy to pick our own values for those variables. With averages, it''s often easiest to just treat each member of the group as the same. i.e. let''s say that in this case, we have 8 identical boxes with 12 clothing items ...”
February 2, 2019
ceilidh.erickson posted a reply to Is tutoring necessary for Verbal? in the GMAT Strategy forum
“In my opinion, no. Don''t get a tutor... yet. When students say "I don''t have much time, so I''ll get a tutor rather than studying on my own," that''s usually not a recipe for success. Tutoring is most productive when it''s supplementing significant time spent studying on your own. Tutors ...”
February 2, 2019
ceilidh.erickson posted a reply to Guidance on study plan in the GMAT Strategy forum
“Yes, this is more than enough material to get started with. Here''s what you should do: 1. Analyze the practice test you''ve taken in a lot of depth. Which areas were you weakest? Strongest? Fastest? Slowest? Decide which topics and question types need more of your time and attention. Be very ...”
February 2, 2019
Brent@GMATPrepNow posted a reply to Beth has a collection of 8 boxes of clothing for a charity, in the Problem Solving forum
“One box contains 12 items of clothing Let t, u, v, w, x, y, z = the number of items in each of the other 7 boxes Beth has a collection of 8 boxes of clothing for a charity, and the average (arithmetic mean) number of pieces of clothing per box is c. We can write: (t + u + v + w + x + y + z + ...”
February 2, 2019
Jay@ManhattanReview posted a reply to One number, k, is selected at random from a set of 11 in the Data Sufficiency forum
“If k = 10 is a member of the set, then the probability that the number randomly selected in 10 = 1/11; however, If k = 10 is a NOT member of the set, then the probability that the number randomly selected in 10 = 0. So, we have to determine whether 10 is a member of the set. Let''s take each ...”
February 2, 2019
Rich.C@EMPOWERgmat.com posted a reply to A paint crew gets a rush order to paint 80 houses in a new d in the Problem Solving forum
“Hi All, We''re told that a paint crew gets a rush order to paint 80 houses in a new development. They paint the first Y houses at a rate of X houses per week. Realizing that they''ll be late at this rate, they bring in some more painters and paint the rest of the houses at the rate of 1.25X ...”
February 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to Two-thirds of the roads from A to B are at least 5 miles in the Problem Solving forum
“Hi All, We''re told that 2/3 of the roads from A to B are at least 5 miles long, and 1/4 of the roads from B to C are at least 5 miles long. We''re asked to randomly pick a road from A to B and then randomly pick a road from B to C and determine the probability that AT LEAST ONE of the roads you ...”
February 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to Is tutoring necessary for Verbal? in the GMAT Strategy forum
“Hi kyuhunl, The degree to which you might find tutoring useful will depend greatly on the study materials that you''re currently using and how quickly you can learn (and properly practice) certain concepts and Tactics. Before I can offer you the specific advice that you’re looking for, it ...”
February 1, 2019
Brent@GMATPrepNow posted a reply to Perpendicular lines m and n... in the Data Sufficiency forum
“ Given: Perpendicular lines m and n intersect at (0,b) Target question: What is the value of b? Statement 1: The slope of the line m is -1/2 Since line n is PERPENDICULAR to line m, we know that line n has slope 2 However, we can raise and lower the two lines so that the value of b is ...”
February 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to Suppose we have six marbles: 3 blue marbles, 2 red marbles, in the Problem Solving forum
“Hi All, We''re told that we have six marbles: 3 blue marbles, 2 red marbles, and one green marble - and that we are going to put them into three cups: a black cup, a white cup, and a purple cup. The only restriction is that the two red marbles CANNOT be in the same cup, meaning that we could put ...”
January 31, 2019
Rich.C@EMPOWERgmat.com posted a reply to During a two-week period, the price of an ounce of silver in the Problem Solving forum
“Hi All, We''re told that during a two-week period, the price of an ounce of silver INCREASED by 25 percent by the end of the first week and then DECREASED by 20 percent of this new price by the end of the second week. We''re asked, if the price of silver was X dollars per ounce at the beginning ...”
January 31, 2019
Jay@ManhattanReview posted a reply to Is the median of the 3 different integers equal to their in the Data Sufficiency forum
“Let''s take each statement one by one. 1) The median of the 3 integers is 19. Say the three integers are: x, y and z such that x < y < z Case 1: Say the integers are 1, 19, 20. Average ≠ Median. The answer is No. Case 2: Say the integers are 18, 19, 20. Average = Median. The ...”
January 31, 2019
Jay@ManhattanReview posted a reply to A jar contains only black marbles and white marbles. If two in the Data Sufficiency forum
“Say there are a total of 3x numbers of marbles; thus, there are 2x numbers of black marbles and x numbers of white marbles. We have to get the value of x. Let''s take each statement one by one. (1) If two marbles were to be drawn, simultaneously and at random, from the jar, there is a 5/12 ...”
January 31, 2019
Jay@ManhattanReview posted a reply to If the drama club and music club is combined, what percent in the Data Sufficiency forum
“The key to this question is not to assume that members of the drama club and that of music club are exclusive, i.e., if X is a member of the drama club, he/she cannot be a member of the music club. The number of members of both the club is not given, thus, the answer is E. The correct answer: ...”
January 31, 2019
Rich.C@EMPOWERgmat.com posted a reply to A doctor prescribed 18 cubic centimeters of a certain drug t in the Problem Solving forum
“Hi All, This question is essentially about working through the necessary arithmetic. Thankfully, the math itself isn''t that tough, but you do have to stay organized to make sure that you''re setting up the proper calculations. We''re told that a typical dose of a drug is 2 cm^3 per 15 ...”
January 31, 2019
Rich.C@EMPOWERgmat.com posted a reply to A metal company's old machine makes bolts at a constant rate in the Problem Solving forum
“Hi All, The answer choices to this question provide a fantastic shortcut. With the two machines that we''re given, we know that... Old Machine = 100 bolts/hour New Machine = 150 bolts/hour If they start at the same time, the two machines will create 250 bolts/hour The question asks ...”
January 31, 2019
Rich.C@EMPOWERgmat.com posted a reply to A lecture course consists of 595 students. The students are in the Problem Solving forum
“Hi All, We''re told that a lecture course consists of 595 students and that the students are to be divided into discussion sections, each with an EQUAL number of students. We''re asked which of the following CANNOT be the number of students in a discussion section. This question is really just ...”
January 31, 2019
Rich.C@EMPOWERgmat.com posted a reply to What is the greatest prime factor of 3^6 - 1? in the Problem Solving forum
“Hi All, A number of the posts have provided elegant solutions to this question. The basic math behind this prompt is Arithmetic and Prime Factorization though, so if you don''t immediately "see" the elegant approach, you can still get to the answer.... We''re asked to find the ...”
January 31, 2019
Brent@GMATPrepNow posted a reply to How many females? (GMAT Prep 2) in the Data Sufficiency forum
“Target question: What percent of the students in the class were females? Let''s use the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it (aka overlapping sets questions). Here, we have a ...”
January 30, 2019
Brent@GMATPrepNow posted a reply to A doctor prescribed 18 cubic centimeters of a certain drug t in the Problem Solving forum
“We can use equivalent ratios to determine what the dosage SHOULD have been. We''ll use the ratio of drug dosage (in cubic centimeters)/body weight (in pounds) Let x = the dosage (in cubic centimeters) the patient SHOULD have received We get: 2/15 = x/120 Cross multiply to get: 15x = ...”
January 30, 2019
Jay@ManhattanReview posted a reply to Dwight and Mose decide to build a new barn on their farm, an in the Problem Solving forum
“Since the question asks for the work left when Mose begins his third shift, Dwight must have done three and Mose must have done two shift. Since we will have to deal with 1/4 three times and 1/6 two times, for the ease of calculation, let''s assume that total work = (4^3)*(6^2) = 2304 1. Work ...”
January 30, 2019
Jay@ManhattanReview posted a reply to Each of three students is given fifteen tokens to spend at a in the Data Sufficiency forum
“Already answered in the BTG. https://www.beatthegmat.com/each-of-three-students-is-given-fifteen-tokens-to-spend-at-a-t303697.html Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes San Francisco | GMAT Tutoring Boston | GRE Prep Philadelphia | ...”
January 30, 2019
Jay@ManhattanReview posted a reply to The largest bonus that Felix can receive this year is equal in the Data Sufficiency forum
“Say Felix''s annual salary is $S. Thus, The largest bonus that Felix can receive = 20% of S = S/5; The smallest bonus that Felix can receive = 30% of 20% of S = 3S/50 We have to determine that value of S. 1. The smallest possible bonus that Felix can receive this year is$4800.00. ...”
January 30, 2019
Brent@GMATPrepNow posted a reply to Marla starts running around a circular track at the same... in the Problem Solving forum
“Let t = the time (in HOURS) that it takes Marla to complete 4 more laps than Nick. So, after t hours, we can write: (Marla''s lap count) = (Nick''s lap count) + 4 Now that we have a "word equation" we need only fill in the missing information Marla completes 32 laps per hour We can ...”
January 29, 2019
Brent@GMATPrepNow posted a reply to Paul, a painter, paints only flowers or cats in his notebook in the Data Sufficiency forum
“I thought I''d point out that the approach demonstrated by Fabio and Jay is known as the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it. Here, we have a population of paintings, and the ...”
January 29, 2019
Brent@GMATPrepNow posted a reply to f(x) has the properties, f(x+y) = x + f(y) and f(0) = 5. Wha in the Problem Solving forum
“Given: f(x+y) = x + f(y) What is the value of f(100)? We need to somehow use the fact that f(0) = 5 to help us determine the value of f(100). Notice that we can rewrite 100 as 100 + 0 According to our the function f, we know that: f(100 + 0) = 100 + f(0) = 100 + 5 = 105 Answer: C ...”
January 29, 2019
Brent@GMATPrepNow posted a reply to Leila is playing a carnival game in which she is given 4 in the Problem Solving forum
“Given: P(succeeds on 1 throw) = 1/5 P(succeeds at least 3 times) = P(succeeds 4 times OR succeeds 3 times) = P(succeeds 4 times) + P(succeeds 3 times) P(succeeds 4 times) P(succeeds 4 times) = P(succeeds 1st time AND succeeds 2nd time AND succeeds 3rd time AND succeeds 4th time) = ...”
January 29, 2019
Brent@GMATPrepNow posted a reply to A waitress's income consist of her salary and tips. During in the Problem Solving forum
“APPROACH #1 - start with a convenient value of the server''s salary Let''s say her salary is $4 GIVEN: her tips were 5/4 of her salary 5/4 of$4 = $5 So, her tip total was$5 What fraction of her income for the week came from tips? Income = salary + tips = $4 +$5 = $9 Fraction =$5 /$9 ...” January 29, 2019 Brent@GMATPrepNow posted a reply to To create a part for a certain piece of machinery, four equa in the Problem Solving forum “IMPORTANT: the diagrams in GMAT problem solving questions are DRAWN TO SCALE unless stated otherwise. We can use this fact to solve the question by simply "eyeballing" the diagram. The question is basically asking us to determine what percent of the circle is NOT shaded. Well, ...” January 29, 2019 Brent@GMATPrepNow posted a reply to If (x+y)/z = -2, is x positive? in the Data Sufficiency forum “Target question: Is x positive? Given: (x + y)/z = -2 Since the question asks about the variable x, let''s solve this equation for x. (x + y)/z = -2 So, x + y = -2z And, x = -2z - y This allows us to REPHRASE the target question.... REPHRASED target question: Is -2z - y positive? ...” January 29, 2019 Jay@ManhattanReview posted a reply to A store sells two types of birdfeeder: Alphas and Bravos. in the Data Sufficiency forum “It''s here: https://www.beatthegmat.com/a-store-sells-two-types-of-birdfeeder-alphas-and-bravos-t304802.html Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Los Angeles | GMAT Tutoring Tampa | GRE Prep Miami | TOEFL Prep Classes Boston | and many ...” January 29, 2019 Jay@ManhattanReview posted a reply to Of the 66 people in a certain auditorium, at most 6 people h in the Data Sufficiency forum “Let''s take each statement one by one. (1) More of the people in the auditorium have their birthday in February than in March. Since to exclude January, from February to December, in each month, 6 persons b''day must fall in each of these 11 months. However, we know that in March, the number ...” January 29, 2019 Jay@ManhattanReview posted a reply to Paul, a painter, paints only flowers or cats in his notebook in the Data Sufficiency forum “https://i.postimg.cc/D8f6fGHm/Picture1.png Thus, (7 + 11) + (x + 11) = x + 39 => y = 21. Sufficient. The correct answer: C Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes Los Angeles | GMAT Tutoring Tampa | GRE Prep Miami | TOEFL Prep ...” January 29, 2019 Rich.C@EMPOWERgmat.com posted a reply to A new tower has just been built at the Verbico military in the Problem Solving forum “Hi j_shreyans, I''m a big fan of TESTing Values (Mitch''s explanation), but this question can also be solved with algebra…. We''re told that adding a new tower to an existing hospital allows fore 3 times the number of available beds that were there before the tower was built: Just the ...” January 28, 2019 Rich.C@EMPOWERgmat.com posted a reply to A certain company has 18 equally qualified applicants for 4 in the Problem Solving forum “Hi All, We''re told that a certain company has 18 equally qualified applicants for 4 open positions. We''re asked for the number of different groups of 4 applicants that can be chosen by the company to fill the positions if the order of selection does not matter. This question is a fairly ...” January 28, 2019 Rich.C@EMPOWERgmat.com posted a reply to When 12 marbles are added to a rectangular aquarium, the wat in the Problem Solving forum “Hi All, We''re told that when 12 marbles are added to a rectangular aquarium, the water in the aquarium rises 1 1/2 inches. We''re asked how many marbles must be added to the aquarium in total to raise the water 2 3/4 inches. This question is ultimately about ratios, so you can approach the math ...” January 28, 2019 Brent@GMATPrepNow posted a reply to The table above shows the GPA of 20 students last semester. in the Problem Solving forum “---------------ASIDE-------------- A little extra background on standard deviations above and below the mean If, for example, a set has a standard deviation of 4, then: 1 standard deviation = 4 2 standard deviations = 8 3 standard deviations = 12 1.5 standard deviations = 6 0.25 ...” January 28, 2019 Brent@GMATPrepNow posted a reply to A dental licensure exam requires a 75% minimum score in orde in the Data Sufficiency forum “ Given: A dental licensure exam requires a 75% minimum score in order to pass each section Target question: Did Jennifer pass the 30-question third section? 75% of 30 = 22.5 So, in order to get at least 75% in the 3rd section, Jennifer must correctly answer 23 or more questions in the 3rd ...” January 28, 2019 Rich.C@EMPOWERgmat.com posted a reply to A certain library assesses fines for overdue books as in the Problem Solving forum “Hi ALL, This question includes a ''conditional statement'' that effects how you''re supposed to handle each "step" in the math: "for each additional day....., the total fine is EITHER increased by 30 cents OR doubled, whichever results in the LESSER AMOUNT." Since ...” January 27, 2019 Rich.C@EMPOWERgmat.com posted a reply to Machines A and B, working together, take t minutes to in the Problem Solving forum “Hi All, We''re told that Machines A and B, working together, take T minutes to complete a particular work. Machine A, working alone, takes 64 minutes more than T to complete the same work. Machine B, working alone, takes 25 minutes more than T to complete the same work. We''re asked for the ...” January 27, 2019 Brent@GMATPrepNow posted a reply to Barbara invests$2400 in the National Bank at 5%. How much in the Problem Solving forum
“Barbara invests $2400 in the National Bank at 5%. So, her annual income for this investment = 5% of$2400 = $120 Let x = the additional money Barbara must invest at 8% So, her annual income for this investment = 8% of x = 0.08x So, Barbara''s TOTAL annual income =$120 + 0.08x We want the ...”
January 27, 2019
Brent@GMATPrepNow posted a reply to A certain library assesses fines for overdue books as in the Problem Solving forum
“1st day - $0.10 2nd day -$0.20 or $0.40 (double or add$0.30) $0.20 is the lesser amount 3rd day -$0.40 or $0.50 (double or add$0.30) $0.40 is the lesser amount 4th day -$0.80 or $0.70 (double or add$0.30) $0.70 is the lesser amount The correct answer is B Cheers, Brent” January 27, 2019 Rich.C@EMPOWERgmat.com posted a reply to When 12 marbles are added to a rectangular aquarium, the in the Problem Solving forum “Hi All, We''re told that when 12 marbles are added to a rectangular aquarium, the water in the aquarium rises 1 1/2 inches. We''re asked how many marbles must be added to the aquarium in total to raise the water 2 3/4 inches. This question is ultimately about ratios, so you can approach the math ...” January 26, 2019 Rich.C@EMPOWERgmat.com posted a reply to Barbara invests$2400 in the National Bank at 5%. How much in the Problem Solving forum
“Hi All, We''re told that Barbara invests $2400 in the National Bank at 5%. We''re asked how much additional money she must invest at 8% so that the TOTAL annual income will be equal to 6% of her entire investment. This question can be approached in a number of different ways, including by ...” January 26, 2019 Brent@GMATPrepNow posted a reply to Probability/ combination in the Problem Solving forum “P(Tamara and Inga are BOTH chosen for the jury) = (# of ways to choose 7 people that include Tamara and Inga)/(TOTAL # of ways to choose 7 people) # of ways to choose 7 people that include Tamara and Inga Stage 1: place Tamara and Inga on the jury. This can be accomplished in 1 way Stage 2: ...” January 26, 2019 Brent@GMATPrepNow posted a reply to A sports team played 100 games last season. Did this team in the Data Sufficiency forum “Target question: Did this team win at least half of the games it played last season? Rephrased target question: Did this team win more than 49 games? Statement 1: The team won 60% of its first 65 games In other words, the team won 39 of its first 65 games Since we don''t know the results ...” January 26, 2019 Rich.C@EMPOWERgmat.com posted a reply to Ratio in the Problem Solving forum “Hi All, We''re told that a in the first M games of a team´s season, the ratio of the team´s wins to its losses was 1:2 and in the subsequent N games, the ratio of the team´s wins to losses was 1:3. If M:N = 4:5, we''re asked for the ratio of the team´s wins to its losses for all M+N games. ...” January 25, 2019 Rich.C@EMPOWERgmat.com posted a reply to A major airplane manufacturer announced the sale of 150 in the Problem Solving forum “Hi All, We''re told that a major airplane manufacturer announced the sale of 150 small airliners at$125 million each, 75 medium sized airliners at $175 million each, and 60 large airliners at$220 million each. We''re asked for the percentage of the company''s income that came from large and ...”
January 25, 2019
Brent@GMATPrepNow posted a reply to If 2 roots of the equation x^2+px+q=0 are -3 and 2, what is in the Problem Solving forum
“GIVEN: the roots/solutions are x = -3 and x = 2 Notice that x = -3 and x = 2 are solutions to the equation (x + 3)(x - 2) = 0 If we expand and simplify the left side of the equation, we get: x² + x - 6 = 0 So, the equation x² + x - 6 = 0 has roots -3 and 2 Compare this to x² + px + q = 0 to ...”
January 25, 2019
Brent@GMATPrepNow posted a reply to The numbers m, n, and K are all positive integers. Given tha in the Problem Solving forum
“Different approach: The question asks "which of the following must also be a positive integer factor of K?" So, if we can find an answer choice that is NOT a factor of K we can ELIMINATE that answer choice. A. m + n If K = 12, then if COULD be the case that m = 4 and n = 6 In ...”
January 25, 2019
Brent@GMATPrepNow posted a reply to The numbers m, n, and K are all positive integers. Given tha in the Problem Solving forum
“GIVEN: m is a factor of K This means that we can write: K = md for some integer d If m and d are both integers, then m and d are both factors of K Notice that, if K = md, then d = K/m, which means K/m is a factor of K Answer: D Cheers, Brent”
January 25, 2019
Brent@GMATPrepNow posted a reply to If, J, K, L, M, and N are positive integers in ascending ord in the Data Sufficiency forum
“ Given: J, K, L, M, and N are positive integers in ascending order Target question: What is the value of L? Statement 1: The value of K is 3. There are many scenarios that satisfy statement 1. Here are two: Case a: J = 1, K = 3, L = 4, M = 7, N = 8. In this case, the answer to the ...”
January 25, 2019
Jay@ManhattanReview posted a reply to Each number in each of lists L and M above is positive. in the GMAT Math forum
“Given that the ratio of the average (arithmetic mean) of the numbers in list L to the average of the numbers in list M is 3 to 7, let''s take the average of list L = 3x and the average of list M = 7x. Thus, the sum of 7 numbers in list (M + L) = 4*(7x) + 5*(3x) = 28x + 15x = 43x Thus, average ...”
January 25, 2019
Jay@ManhattanReview posted a reply to For a certain city's library, the average cost of purchasing in the Data Sufficiency forum
“This one is already answered. Here it is: https://www.beatthegmat.com/for-a-certain-city-s-library-the-average-cost-t295970.html Hope this helps! -Jay _________________ Manhattan Review GMAT Prep Locations: GMAT Classes New York | GMAT Tutoring Dallas | GRE Prep San Diego | TOEFL Prep ...”
January 25, 2019
Brent@GMATPrepNow posted a reply to Mary and Kate are running clockwise around a circular track in the Problem Solving forum
“To get a better idea of what''s happening, let''s sketch the set-up: https://i.imgur.com/SwHzFJD.png Mary is faster than Kate, we can say that Kate has a 250 meter head start. In other words, when Mary closes that 250-meter gap, she will pass Kate for the FIRST time. ...”
January 24, 2019
Rich.C@EMPOWERgmat.com posted a reply to A miniature roulette wheel is divided into 10 equal sectors, in the Problem Solving forum
“Hi All, We''re told that a miniature roulette wheel is divided into 10 equal sectors, each bearing a distinct integer from 1 to 10, inclusive. Each time the wheel is spun, a ball randomly determines the winning sector by settling in that sector and the wheel is spun three times. We''re asked for ...”
January 24, 2019
Rich.C@EMPOWERgmat.com posted a reply to The total cost of a vacation was divided among 3 people. If in the Problem Solving forum
“Hi All, We''re told that the total cost of a vacation was divided equally among 3 people and that if the total cost of the vacation had been divided equally among 4 people, then the cost per person would have been $50 LESS. We''re asked for the total cost of the vacation. This question can be ...” January 24, 2019 Rich.C@EMPOWERgmat.com posted a reply to A shirt that costs k dollars is increased by 30%, then by an in the Problem Solving forum “Hi All, We''re told that the price of a shirt that costs K dollars is increased by 30%, then that price is increased by an additional 50%. We''re asked for the final price of the shirt in dollars, in terms of K. This question can be solved in a number of different ways - including Algebraically ...” January 24, 2019 Brent@GMATPrepNow posted a reply to In the rectangular coordinate system above, the area of tria in the Problem Solving forum “Let''s draw a rectangle around the triangle (as shown below) and then subtract from the rectangle''s area (28) the areas of the 3 right triangles that surround the triangle in question. We get the following: http://s13.postimage.org/a47qx0j8j/triangle_in_coordinate_plane_2.jpg So, the area ...” January 24, 2019 Brent@GMATPrepNow posted a reply to A shirt that costs k dollars is increased by 30%, then by an in the Problem Solving forum “A shirt that costs k dollars is increased by 30%, So, the new coast = k + (30% of k) = k + 0.3k = 1.3k ASIDE So, increasing a value by 30% is the same as multiplying that value by 1.3 Similarly, increasing a value by 20% is the same as multiplying that value by 1.2 And increasing a value by ...” January 24, 2019 Brent@GMATPrepNow posted a reply to The total cost of a vacation was divided among 3 people. If in the Problem Solving forum “Let T = total cost of vacation So, T/3 = cost per person with THREE people And T/4 = cost per person with FOUR people If the total cost of the vacation had been divided equally among 4 people, the cost per person would have been$50 less. In other words (cost per person with FOUR people) = ...”
January 24, 2019
Rich.C@EMPOWERgmat.com posted a reply to Getting out of a Rut: Overcoming 680 over 3 consecutive atte in the I just Beat The GMAT! forum
“Hi markymarc89, That''s OUTSTANDING news! With a 740/Q50, you can comfortably apply to ANY Business Schools that interest you. Since you''ve already taken care of your applications, there''s not much else to do at this point (unless you want to consider applying to any additional Schools). We''re ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to A restaurant meal cost $35.50 and there was no tax. If the t in the Problem Solving forum “Let''s first see what happens when the tip is 10% 10% of$35.50 = $3.55 So, the total cost (WITH a 10% tip) =$35.50 + $3.55 =$39.05 So, the total cost must be GREATER THAN $39.05 This means the TOTAL cost could be$39.06 Check the answer choices.... A, D and E do not allow for the total cost ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to If i, a and b are integers, is 4(3b + 2) = 5a? (1) If i is in the Data Sufficiency forum
“Target question: Is 4(3b + 2) = 5a? Statement 1: If i is divided by 5 the quotient is a and the remainder is 3 ASIDE: There''s a nice rule that says, "If N divided by D equals Q with remainder R, then N = DQ + R" For example, since 17 divided by 5 equals 3 with remainder 2, then we ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to If the average of four numbers is 35, how many of the number in the Data Sufficiency forum
“ Given: The average of four numbers is 35 Target question: How many of the numbers are less than 35? If we''re able to see that the statements FEEL insufficient, and we''re able to come up with some counter-examples in our head, then we can head straight to... . . . Statements 1 and 2 ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to If x is a positive integer, is x<16? 1) x is less than t in the Data Sufficiency forum
“Target question: Is x < 16? Statement 1: x is less than the average (arithmetic mean) of the first ten positive integers Since the first ten positive integers are EQUALLY SPACED, the average = (smallest number + biggest number)/2 = (1 + 10)/2 = 5.5 So, x < 5.5 Since 5.5 < 16, we ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to What is the measure of each interior angle of a regular deca in the Problem Solving forum
“Useful rule: the sum of the angles in an n-sided polygon = (n - 2)(180º) So, for example, the sum of the angles in an 11-sided polygon = (11 - 2)(180º) = (9)(180º) = 1620º What is the measure of each interior angle of a regular decagon? A decagon has 10 sides. The sum of the angles in ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to x=? in the Data Sufficiency forum
“Target question: What is the value of x? Statement 1: x³ - x = 0 Factor to get: x(x² - 1) = 0 Factor again to get: x(x + 1)(x - 1) = 0 So, it could be the case that x = 0, x = -1 or x = 1 Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to Ayayai electronics is a company manufacturing MP3 players. in the Problem Solving forum
“I thought I''d point out that Jay''s approach is known as the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it. Here, we have a population of MP3 players, and the two characteristics are: ...”
January 23, 2019
Jay@ManhattanReview posted a reply to Ayayai electronics is a company manufacturing MP3 players. in the Problem Solving forum
“See this image. https://i.postimg.cc/c6X0vM6N/iMe.png Thus, (1,000 + x) + x = 11,000 => x = 5,000 Thus, total number of players = 21,000 + x = 21,000 + 5,000 = 26,000. The correct answer: C Hope this helps! -Jay _________________ Manhattan Review Locations: Manhattan ...”
January 23, 2019
Jay@ManhattanReview posted a reply to M is a rectangular solid. Find the volume of M Statement #1 in the Data Sufficiency forum
“Given: M is a rectangular solid. We have to find the volume of M. We know that the volume of a rectangular solid = a*b*c; where a = = length, b = breadth, and c = height Let''s take each statement one by one. Statement #1: The bottom face of M has an area of 28, and the front face, an ...”
January 23, 2019
Jay@ManhattanReview posted a reply to Brian takes a weekend trip to visit a friend. What is his in the Data Sufficiency forum
“We have to find out the average rate for the there-and-back trip. Let''s take each statement one by one. 1) Brian took the same route for both segments. No information about speeds. Insufficient. 2) Brian averaged 80 mph for the first segment and 50 mph for the second segment. If the ...”
January 23, 2019
Brent@GMATPrepNow posted a reply to If when a certain integer x is divided by 5, the remainder in the Problem Solving forum
“Here''s another (longer) approach: When it comes to remainders, we have a nice rule that says: If N divided by D leaves remainder R, then the possible values of N are R, R+D, R+2D, R+3D,. . . etc. For example, if k divided by 5 leaves a remainder of 1, then the possible values of k ...”
January 22, 2019
Brent@GMATPrepNow posted a reply to If Polygon X has fewer than 9 sides, how many sides does in the Data Sufficiency forum
“Target question: How many sides does Polygon X have? Given: Polygon X has fewer than 9 sides Useful rule: The sum of the angles in an n-sided polygon = (n - 2)(180º) Since the polygon has FEWER than 9 sides, there are are exactly SIX possible cases: case a: There are 8 sides, in ...”
January 22, 2019
Rich.C@EMPOWERgmat.com posted a reply to Of the votes cast on a certain proposal, 80 more were in in the Problem Solving forum
“Hi All, We''re told that of the votes cast on a certain proposal, 80 MORE were in favor of the proposal than were against it and the number of votes against the proposal was 40 percent of the TOTAL vote. We''re asked for the total number of votes cast? (Each vote cast was either in favor of the ...”
January 22, 2019
Rich.C@EMPOWERgmat.com posted a reply to Which of the following is closest to the value of (2^23) in the Problem Solving forum
“Hi All, We''re asked which of the following is closest to the value of (2^23)(5^26). If you don''t immediately see the ''Exponent'' rules that apply to this question, then you can still solve it with some basic Arithmetic and logic. To start, when you multiply a bunch of numbers together, the ...”
January 22, 2019
Rich.C@EMPOWERgmat.com posted a reply to The number 75 can be written as the sum of the squares of 3 in the Problem Solving forum
“Hi All, This question can be solved with a bit of ''brute force'' arithmetic, but the speed with which you solve it will likely depend on how quickly you can write everything down and how you do the work. We''re asked to find the three positive integers, whose squares add up to 75. To start, ...”
January 22, 2019
Brent@GMATPrepNow posted a reply to The number 75 can be written as the sum of the squares of 3 in the Problem Solving forum
“We''re looking for 3 DIFFERENT squares that add to 75 Here are the only squares we need to consider: 1, 4, 9, 16, 25, 36, 49, 64 Can you find 3 that add to 75? After some fiddling, we may notice that 1 + 25 + 49 In other words, 1² + 5² + 7² = 75 We want the SUM of 1 + 5 + 7, which is ...”
January 22, 2019
Brent@GMATPrepNow posted a reply to Bite-sized video lessons from GMAT Prep Now in the GMAT Math forum
“Data Sufficiency Video #2: The Elimination Method Video: https://www.youtube.com/watch?v=amhxP9My_pU Cheers, Brent”
January 22, 2019
Jay@ManhattanReview posted a reply to In a certain international contest the winners received only in the Data Sufficiency forum
“Say The number of gold received by France = x; The number of silver received by France = y; The number of gold received by Spain = a; The number of silver received by Spain = b Thus, total medals received by France = x + y; and total medals received by Spain = a + b We have to get ...”
January 22, 2019
Brent@GMATPrepNow posted a reply to The average salary of 15 people in the shipping department in the Problem Solving forum
“]The average salary of 15 people in the shipping department at a certain firm is $20,000 So, (sum of all 15 salaries)/15 =$20,000 Multiply both sides by 15 to get: sum of all 15 salaries = $300,000 The salary of 5 of the employees is$25,000 each and the salary of 4 of the employees is $16,000 ...” January 21, 2019 ceilidh.erickson posted a reply to In the figure above, segments PQ and QR are each parallel to in the Data Sufficiency forum “It is generally true in Data Sufficiency that if the question asks you for a PROPORTION, you do not need concrete values to answer it. In this case, we''re asked for a RATIO of horizontal and vertical lengths, but not for actual values. We can think of any slope as a RATIO of vertical to ...” January 21, 2019 ceilidh.erickson posted a reply to At a certain fruit stand, the price of each apple is 40 cent in the Problem Solving forum “We can also think of this as a WEIGHTED AVERAGE question. If we buy some 40 cent apples and 60 cent oranges, the average price for all fruit will be between 40 and 60. If we buy more apples, it''ll be closer to 40. If more oranges, it''ll be closer to 60. --|--------------|----| ...” January 21, 2019 ceilidh.erickson posted a reply to Journalist: Every election year at this time the state gover in the Critical Reasoning forum “For more on using this strategy for BOLDFACE questions on CR, see: https://www.beatthegmat.com/most-of-western-music-since-the-renaissance-has-been-based-t305309.html#823603 https://www.beatthegmat.com/gmat-official-guide-2019-in-countries-where-automobile-t303686.html#818265 ...” January 21, 2019 ceilidh.erickson posted a reply to What is the average (arithmetic mean) of x, y, and z? in the GMAT Math forum “You should always start by REPHRASING any DS question to determine: what''s the minimum information that would be sufficient to answer this question? Our question is "what is the average of x, y, and z?" First, rephrase algebraically: (x + y + z)/3 = ? What would we need in order ...” January 21, 2019 ceilidh.erickson posted a reply to Journalist: Every election year at this time the state gover in the Critical Reasoning forum “The goal in any BOLDFACE question is to deconstruct the argument, and determine the role of each statement: - author''s conclusion / position - reasoning that supports the author''s position - the counterpoint / what others believe - support for the counterpoint - neutral / background ...” January 21, 2019 ceilidh.erickson posted a reply to As even most smokers will admit, smoking is both unhealthy a in the Sentence Correction forum “This two-part parallelism - also known as CLOSED PARALLELISM - is very common on the GMAT. Any time you see the following: BOTH ____ AND ____ EITHER ____ OR ______ NOT ONLY _____BUT ALSO _______ NOT ________ BUT _________ etc, ... you need to make sure that what comes right after the ...” January 21, 2019 ceilidh.erickson posted a reply to As even most smokers will admit, smoking is both unhealthy a in the Sentence Correction forum “This question is testing PARALLELISM and SUBJECT/VERB agreement. When there is a closed parallel marker such as BOTH X AND Y, the part of the sentence that follows "both" must be parallel to the part that follows "and." In each of the answer choices, I''ve highlighted what ...” January 21, 2019 Brent@GMATPrepNow posted a reply to A triangle has side lengths of a, b, and c centimeters. in the GMAT Math forum “Target question: Does each angle in the triangle measure less than 90 degrees? Given: A triangle has side lengths of a, b, and c centimeters Statement 1: The 3 semicircles whose diameters are the sides of the triangle have areas that are equal to 3 cm², 4 cm², and 6 cm², respectively. ...” January 21, 2019 ceilidh.erickson posted a reply to The senate candidate expressed outrage that few judges have in the Critical Reasoning forum “This is NOT a Manhattan Prep question. It is not even a GMAT-style question; it is an LSAT-style question. Students should disregard this question. The poster should also take care to only cite sources if he/she got the problem directly from the source. This problem seems to have been taken from ...” January 21, 2019 Brent@GMATPrepNow posted a reply to If x-2y=4, then x^2-4xy+4y^2-x+2y=? in the Problem Solving forum “GIVEN: x - 2y = 4 We want to find the value of x² - 4xy + 4y² - x + 2y We should notice that x² - 4xy + 4y² is equal to (x - 2y)² We should notice that - x + 2y is equal to -(x - 2y) We get: x² - 4xy + 4y² - x + 2y = (x - 2y)² - (x - 2y) Now replace x - 2y with 4 to get: = (x - ...” January 21, 2019 Brent@GMATPrepNow posted a reply to What is the value of z in the triangle above? (1) x+y=139 ( in the Data Sufficiency forum “Target question: What is the value of z in the triangle above? IMPORTANT: Since angles in a triangle must add to 180 degrees, we can write: x + y + z = 180 Statement 1: x + y = 139 Take: x + y + z = 180 and replace (x + y) with 139 to get: 139 + z = 180 Solve equation for z to get: z = 41 ...” January 21, 2019 Brent@GMATPrepNow posted a reply to 10 different biology books and 8 different chemistry books l in the Problem Solving forum “Take the task of selecting 4 books and break it into stages. Stage 1: Select two biology books Since the order in which we select the books does not matter, we can use combinations. We can select 2 books from 10 books in 10C2 ways (45 ways) So, we can complete stage 1 in 45 ways If ...” January 21, 2019 Brent@GMATPrepNow posted a reply to What was the number of defective batteries in a shipment of in the Data Sufficiency forum “Target question: What was the number of defective batteries in a shipment of 4000 batteries? Statement 1: In a particular sample of 10 batteries selected from the shipment, 1 was defective. Don''t make the mistake of assuming that this means 1/10 of ALL batteries are defective. There''s no ...” January 21, 2019 Jay@ManhattanReview posted a reply to What is the value of x? in the Data Sufficiency forum “Note that a prime number has 3 factors, a perfect square of a prime number has three factors, a perfect square of a non-prime number and others has more than three factors. 1. Prime number: Say 2, 3, 5, 7, 11. All have two factors. 2. Perfect square of prime numbers: Say 4, 9, 25, 49, etc. All ...” January 21, 2019 Jay@ManhattanReview posted a reply to If a is a positive integer and 81 divided by a in the Data Sufficiency forum “Given: a is a positive integer and 81 divided by a results in a remainder of 1. We have to find out the value of a. From the given information, we know that a is a factor of 80. Let''s take each statement one by one. 1) The remainder when a is divided by 40 is 0. => a is a factor ...” January 21, 2019 Jay@ManhattanReview posted a reply to A certain furniture store must choose between trucking in the GMAT Math forum “Given: Company A''s charges: Per delivery Company B''s charges: Per week + A mileage charge We have to determine which of the two companies would charge less to the store. Say the number of deliveries per week = n and mileage per week = m Let''s take each statement one by one. (1) ...” January 21, 2019 Jay@ManhattanReview posted a reply to If $$\sqrt{x}\$$ and $$\sqrt{y}$$ are nonzero in the GMAT Math forum “Given: √x and √y are nonzero integers We have to find out the remainder when x is divided by y. Let''s take each statement one by one. (1) √x – √y = 1 Case 1: Say x = 4 and y = 1, then we have √4 – √1 = 1. The remainder when x = 4 is divided by y = 1 is 0. Case 2: Say x ...” January 21, 2019 Rich.C@EMPOWERgmat.com posted a reply to If Sam were twice as old as he is, he would be 40 years in the Problem Solving forum “Hi All, We''re told that if Sam were TWICE as old as he is, then he would be 40 years older than Jim and that Jim is currently 10 years YOUNGER than Sam. We''re asked for Sam''s current age. This question can be solved in a couple of different ways, including by TESTing THE ANSWERS. Since the ...” January 20, 2019 Rich.C@EMPOWERgmat.com posted a reply to [x] denotes the least integer greater than or equal to x ... in the Problem Solving forum “Hi All, This is an example of a ''Symbolism'' question - the prompt ''makes up'' a math symbol, tells you what it means, then asks you to perform a calculation using it. When dealing with these types of symbols, it often helps to jot down a few examples, so that you understand the work that will ...” January 20, 2019 Rich.C@EMPOWERgmat.com posted a reply to On a game show, a contestant is given three keys, each of in the Problem Solving forum “Hi All, We''re told that on a game show, a contestant is given three keys, each which opens exactly one of three identical boxes. The first box contains$1, the second $100, and the third$1000. The contestant assigns each key to one of the boxes and wins the amount of money contained in any box ...”
January 20, 2019
Brent@GMATPrepNow posted a reply to On a game show, a contestant is given three keys, each of in the Problem Solving forum
“There aren''t many possible outcomes, so let''s start by listing all possibilities. Let A, B and C represent the 3 boxes, and let a, b, c, be the keys for those boxes (in that same order). A = $1 prize, B =$100 prize and C = $1000 prize If the boxes are arranged as A-B-C, then these are ...” January 20, 2019 Brent@GMATPrepNow posted a reply to Which of the following lists a number of points at which a in the Problem Solving forum “http://s27.postimg.cc/531tmnqpr/circ_int.jpg Answer: E The important takeaway here is that "intersect" does not necessarily mean "pass through" So, a line that is tangent to a circle (touching the circle but not passing through it) can be said to intersect the circle. To ...” January 20, 2019 Brent@GMATPrepNow posted a reply to [x] denotes the least integer greater than or equal to x ... in the Problem Solving forum “First, let''s take a moment to get a good idea of what this strange notation means. A few examples: -1 < x/2 ≤ 0 Multiply all sides of the inequality by 2 to get: -2 < x ≤ 0 Check the answer choices.... Only -3/2 falls inside that range. Answer: B Cheers, Brent” January 20, 2019 Brent@GMATPrepNow posted a reply to Full Plan in the The 60-Day GMAT Study Guide forum “Hi Aliya, I have a feeling that your email system is treating the emails as spam. Have you checked your spam/junk folders? You might to sign up for the emails again, but this time, be sure to add guide@beatthegmat.com as a contact in your e-mail system. This will help ensure that the daily ...” January 20, 2019 Brent@GMATPrepNow posted a reply to The average American spends y dollars on food per month, exc in the Problem Solving forum “This is a Variables in the Answer Choices question (VIAC). This question type can be answered algebraically or using the INPUT-OUTPUT approach. Mitch has demonstrated the INPUT-OUTPUT approach, so let''s solve the question algebraically. The average American spends y dollars on food per month, ...” January 20, 2019 Jay@ManhattanReview posted a reply to In a carnival game, players try to toss marbles in to a milk in the Data Sufficiency forum “Say the number of marbles that hit the jug without going in is p and the number of marbles that went into the jug is q. Thus, m = 1*p + 2*q m = p + 2q Since 2q is an even number irrespective of whether q is even or odd, whether m is even of odd would depend on whether p is odd. Question ...” January 20, 2019 Jay@ManhattanReview posted a reply to At the beginning of January 2003, Elizabeth invested money in the Data Sufficiency forum “Say Elizabeth invested$P at r% per annum rate of interest, and the interested in compounded n times in a year. Thus, the rate of interest per period = (r/n)% and the number of periods = 7n Thus, the amount (Say A) after 7 years A = P(1 + (r/n)%)^7n So, there are three variables: P, r ...”
January 20, 2019
Jay@ManhattanReview posted a reply to A disc jockey plays only hip - hop and country - western in the Data Sufficiency forum
“Say the number of hip - hop records is 7 and the number of country - western records is 4. Thus, the total number of records = 4 + 7 = 11. Thus, 4/11 of the records he plays are country - western. The correct answer: D Hope this helps! -Jay _________________ Manhattan Review ...”
January 20, 2019
Jay@ManhattanReview posted a reply to In the figure above, segments PQ and QR are each parallel to in the Data Sufficiency forum
“We have to get the value of the ratio of the length of QR to PQ. Let''s take each statement one by one. (1) The slope of the line that passes through points P and R is 0.75. Say the coordinates of points P are (x1, y1) and the coordinates of points R are (x2, y2); thus, the coordinates of ...”
January 20, 2019
Jay@ManhattanReview posted a reply to A company bought some desks at a price of $150 each and some in the Data Sufficiency forum “Say the number of desks = x and the number of chairs = y Thus, 150x + 50y = Total sales We have to determine whether y ≥ 40. Let''s take each statement one by one. 1) The total price of the desk and chairs is 5,000. 150x + 50y = 5,000 => 3x + y = 100 Case 1: Say y = 40, ...” January 20, 2019 Jay@ManhattanReview posted a reply to What was a certain company's revenue last year? in the Data Sufficiency forum “Say Revenue = R and Expenses = E Let''s take each statement one by one. 1) Last year gross profit was$4,100. Thus, R – E = 4100. Can''t get the unique value of R. Insufficient. 2) Last year revenue was 50% greater than expenses. => R = 1.5E. Can''t get the unique value of R. ...”
January 20, 2019
Jay@ManhattanReview posted a reply to 30 people in total attended an office party for a in the Data Sufficiency forum
“Let''s take each statement one by one. 1) One person ate exactly 2 slices of cake. This statement is open to a couple of interpretations. 1. EXACTLY one person ate exactly 2 slices of cake. 2. AT LEAST one person ate exactly 2 slices of cake. If we take #1 as interpretation, we get that ...”
January 20, 2019
Jay@ManhattanReview posted a reply to Set A = {2, 3, 4, 5}, and set B = {4, 5, 6, 7, 8}. If P = th in the Problem Solving forum
“Apt advice Brent. When it comes to counting questions, many students are reluctant to simply list and count the possible outcomes. -Jay _________________ Manhattan Review Locations: Manhattan Review Kukatpally | GMAT Prep Jayanagar | GRE Prep Tarnaka | Madhapur GRE Coaching | and many ...”
January 20, 2019
Brent@GMATPrepNow posted a reply to If a is a positive integer and 81 divided by a in the Data Sufficiency forum
“Target question: What is the value of a? Given: 81 divided by a results in a remainder of 1 In other words, 81 is 1 greater than some multiple of a This means that 80 is some multiple of a Another way to say this is: a is a divisor of 80 The divisors of 80 are: 1, 2, 4, 5, 8, 10, 16, ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to Set A = {2, 3, 4, 5}, and set B = {4, 5, 6, 7, 8}. If P = th in the Problem Solving forum
“Let''s list and count all possible outcomes. Possible products when 2 is selected from set A: 8, 10, 12, 14, 16 Possible products when 3 is selected from set A: 12, 15, 18, 21, 24 Possible products when 4 is selected from set A: 16, 20, 24, 28, 32 Possible products when 5 is selected from set ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to If Sam were twice as old as he is, he would be 40 years in the Problem Solving forum
“Jim is 10 years younger than Sam Let x = Sam''s PRESENT age So, x - 10 = Jim''s PRESENT age If Sam were twice as old as he is, he would be 40 years older than Jim. TWICE Sam''s age = 2x So, we can write: 2x = (x - 10) + 40 Simplify: 2x = x + 30 Solve: x = 30 Answer: B Cheers, Brent”
January 19, 2019
Brent@GMATPrepNow posted a reply to One night a certain hotel rented 3/4 of its rooms, including in the Problem Solving forum
“This question is a great candidate for the Double Matrix method, whichcan be used for most questions featuring a population in which each member has two characteristics associated with it. Here, we have a population of motel rooms, and the two characteristics are: - air conditioning or no air ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to In a certain pet shop, 1/3 of the pets are dogs and 1/5 of in the Data Sufficiency forum
“Target question: How many of the pets are dogs? Given: 1/3 of pets are dogs & 1/5 of pets are birds Let T = TOTAL number of pets. So, T/3 = number of dogs And T/5 = number of birds Statement 1: There are 30 birds at the pet shop So, T/5 = 30 This means that T = 150, which ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to Is x > y? (1) -4x + 2y < y - 3x (2) wx > wy in the Data Sufficiency forum
“Target question: Is x > y? Statement 1: -4x + 2y < y - 3x Add 4x to both sides to get: 2y < y + x Subtract y from both sides to get: y < x Perfect, the answer to the target question is YES, x IS greater than y Since we can answer the target question with certainty, statement 1 ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to At a certain fruit stand, the price of each apple is 40 cent in the Problem Solving forum
“It turns out that the cost per apple is irrelevant. Here''s why: The average (arithmetic mean) price of the 10 pieces of fruit is 56 cents So, (total value of all 10 pieces of fruit)/10 = 56 cents This means, total value of all 10 pieces of fruit = 560 cents How many oranges must Mary put ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to A set consists of 5 distinct positive integers a, b, c, d, e in the Problem Solving forum
“The mean of all 5 numbers is 8.8 (a + b + c + d + e)/5 = 8.8 Multiply both sides by 5 to get: a + b + c + d + e = 44 The sum of a, c and e is 24 (a + c + e) = 24 So, take a + b + c + d + e = 44 and rewrite as: (a + c + e) + b + d = 44 We get: (24) + b + d = 44 So, b + d = 20 b is the ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to If x and y are consecutive integers such that x < y and x in the GMAT Math forum
“Oops - pressed the wrong button. As you were! Brent”
January 19, 2019
Brent@GMATPrepNow posted a reply to If 3 years ago Jennifer was 22 years old, how old is Carmen in the Data Sufficiency forum
“Target question: How old is Carmen now? Given: 3 years ago Jennifer was 22 years old So, Jennifer''s PRESENT age is 25 Statement 1: 10 years ago, Carmen was twice as old as Jennifer. If Jennifer''s PRESENT age is 25, then Jennifer''s age 10 YEARS AGO was 15 This means Carmen''s age 10 ...”
January 19, 2019
Brent@GMATPrepNow posted a reply to In a barrel full of apples, 45% of the apples weigh more in the Problem Solving forum
“No takers? Let''s say there are 100 apples in the barrel. 45% of the apples weigh MORE THAN 81 grams This means 55% of the apples weigh LESS THAN OR EQUAL to 81 grams In other words, 55 apples weigh LESS THAN OR EQUAL to 81 grams 81% of the apples weigh LESS THAN 145 grams This means 19% ...”
January 18, 2019
Rich.C@EMPOWERgmat.com posted a reply to Danny and Ian are munching on a jar full of candies. Had in the Problem Solving forum
“Hi All, This question is essentially a "Work Formula" question, since it has 2 people working on a task together. You have to be really careful with the details though, since the two given rates are NOT for the same task.... We''re told that Danny can finish off the jar of candies in ...”
January 18, 2019
Rich.C@EMPOWERgmat.com posted a reply to A bus completed first 50 miles of a 120-mile trip at an in the Problem Solving forum
“Hi All, We''re told that a bus completed first 50 miles of a 120-mile trip at an average speed of 20 mph. Then it took a halt of 30 minutes and completed half of the remaining journey at an average speed of 35 mph. We''re asked for the average speed it should complete the REMAINING part of the ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to Passing the 30-question third section in the Data Sufficiency forum
“ Given: A dental licensure exam requires a 75% minimum score in order to pass each section Target question: Did Jennifer pass the 30-question third section? 75% of 30 = 22.5 So, in order to get at least 75% in the 3rd section, Jennifer must correctly answer 23 or more questions in the 3rd ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to 32 teams compete in the World Cup of Soccer. They are divid in the Problem Solving forum
“Perfect approach! ASIDE: We have 4 teams, and 2 teams play a game. So, the number of games played = the number of different ways to select 2 of the 4 teams = 4C2 = 6 Cheers, Brent”
January 18, 2019
Brent@GMATPrepNow posted a reply to Does (a – 2)(b + 4) = 8? in the GMAT Math forum
“Target question: Does (a – 2)(b + 4) = 8? This is a good candidate for rephrasing the target question. When I SCAN the statements, I see that statement 1 has the term ab. This suggests to me that we might benefit from EXPANDING the expression, since that will result in an ab term. Take: (a ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to A fair die has sides labeled with 1, 2, 3, 4, 5, and 6 dots. in the GMAT Math forum
“We want P(select at least one 6) When it comes to probability questions involving "at least," it''s best to try using the complement. That is, P(Event A happening) = 1 - P(Event A not happening) So, here we get: P(getting at least one 6) = 1 - P(not getting at least one 6) What does ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to If x and y are consecutive integers such that x < y and x in the GMAT Math forum
“GIVEN: x and y are consecutive integers such that x < y So, if x is ODD, then y is EVEN One option here is to replace the x''s and y''s with ODD and EVEN and apply the rules for ODDs and EVENs. Or we can just replace x and y with odd and even numbers. Let''s do that. Replace x with 1 ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to is x > 0? in the GMAT Math forum
“Target question: Is x > 0 ? Statement 1: x – y > –8 This statement doesn''t feel sufficient, so I''ll TEST some values. There are several values of x and y that satisfy statement 1. Here are two: Case a: x = 1 and y = 0. In this case, the answer to the target question is YES, x ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to If x is an integer greater than 2, the function f(x) in the GMAT Math forum
“The key here is that f(51) is EQUAL to f(50) Here''s why: According to the definition of the function f, f(51) = (2)(4)(6). . . (48)(50), and f(50) = (2)(4)(6). . . (48)(50) So, f(51) - f(50) = (2)(4)(6). . . (48)(50) - (2)(4)(6). . . (48)(50) = 0 Answer: E Cheers, Brent”
January 18, 2019
Jay@ManhattanReview posted a reply to In the addition above, #, @, and & each represent a dist in the Data Sufficiency forum
“We have # + @ = &, where #, @, and & each represents a distinct, positive digit and & is even We have to get the value of #. Let''s take each statement one by one. (1) # and @ are even and & = 6. There are two possibilities: 1. # = 2 and @ = 4 and 2. # = 4 and @ = 2. No ...”
January 18, 2019
Jay@ManhattanReview posted a reply to A cake recipe uses a constant ratio of 2 teaspoons vanilla in the Data Sufficiency forum
“Given: Ratio vanilla extract (teaspoons) to chocolate (ounce) = 2 : 1 We have to find out how many ounces of chocolate would be needed to make a cake that serves 6 people. Let''s take each statement one by one. 1) The original recipe calls for exactly five teaspoons of vanilla extract. ...”
January 18, 2019
Jay@ManhattanReview posted a reply to A certain packing box contains books between 50 to 60. How in the Data Sufficiency forum
“Given: 50 < Number of books < 60 We have to find out the number of books. Let''s take each statement one by one. 1) If the books are counted by three, there will be one book left over. The statement means that the number of books divided by 3 will leave a remainder 1. Thus, ...”
January 18, 2019
Rich.C@EMPOWERgmat.com posted a reply to Three children, John, Paul, and Ringo, are playing a game. in the Problem Solving forum
“Hi All, We''re told that three children - John, Paul, and Ringo, are playing a game. Each child will choose either the number 1 or the number 2. When one child chooses a number DIFFERENT from those of the other two children, he is declared the winner. If all of the children choose the SAME ...”
January 18, 2019
Rich.C@EMPOWERgmat.com posted a reply to A will was written such that an estate would be divided amon in the Problem Solving forum
“Hi All, We''re told that a will was written such that an estate would be divided among FIVE beneficiaries with the remainder donated to charity, with one stipulation in the will is that no one beneficiary can receive an amount within 20% of another''s amount. One of the beneficiaries received ...”
January 18, 2019
Rich.C@EMPOWERgmat.com posted a reply to If Jake loses 8 pounds, he will weigh twice as much as his s in the Problem Solving forum
“Hi All, This question can be solved with fairly straight-forward Algebra (as some of the other solutions have proven). It can also be solved by TESTing THE ANSWERS and a bit of logic. We''re told that the total weight of Jake and his sister is 278 pounds. We''re also told that if Jake lost 8 ...”
January 18, 2019
Rich.C@EMPOWERgmat.com posted a reply to Need Suggestion on books in the GMAT Strategy forum
“Hi JOHNMC, Raising a 430 to the point that you could consistently score 700+ will likely require at least another 3 months of consistent, guided study - and you''ll have to make significant improvements to how you handle BOTH the Quant and Verbal sections. Thankfully, the GMAT is a consistent, ...”
January 18, 2019
Brent@GMATPrepNow posted a reply to What percentage of his bills did Stanley pay before their in the Data Sufficiency forum
“Target question: What percentage of his bills did Stanley pay before their due dates last month? This is a great candidate for rephrasing the target question. Aside: We have a free video with tips on rephrasing the target question: Let P = # of bills PAID before due date Let T = TOTAL # of ...”
January 17, 2019
Brent@GMATPrepNow posted a reply to Overlapping figures in the Problem Solving forum
“If the area of the square is 4, then each side has length 2 https://i.imgur.com/Ul16WsZ.png At this point, we have a special 30-60-90 right triangle. When we compare this blue triangle to the BASE 30-60-90 right triangle . . . https://i.imgur.com/vrYSacE.png . . . we see that the blue ...”
January 17, 2019
Brent@GMATPrepNow posted a new topic called Set A = {2, 3, 4, 5}, and set B = {4, 5, 6, 7, 8}. If P = th in the Problem Solving forum
“Set A = {2, 3, 4, 5}, and set B = {4, 5, 6, 7, 8}. If P = the product of one number chosen from set A and one number chosen from set B, how many DIFFERENT values of P are possible? A) 14 B) 15 C) 16 D) 18 E) 20 Answer: C Difficulty level: 600 - 650 Source: www.gmatprepnow.com”
January 17, 2019
Brent@GMATPrepNow posted a reply to If 20 Swiss Francs is enough to buy 9 notebooks in the Data Sufficiency forum
“Target question: Is 40 Swiss Francs enough to buy 12 notebooks and 12 pencils? This is a great candidate for rephrasing the target question. Let N = the cost of 1 notebook (in Swiss francs) Let P = the cost of 1 pencil (in Swiss francs) So, 12 notebooks cost 12N and 12 pencils cost 12P ...”
January 17, 2019
Brent@GMATPrepNow posted a reply to The speed of a boat is 5 times the speed at which a river fl in the Problem Solving forum
“Let x = the speed of the river (in miles per hour) So, 5x = the speed of the boat in (miles per hour) Let d = distance traveled (in miles) This means the boat''s speed going UPriver = 5x - x = 4x And the boat''s speed going DOWNriver = x + 5x = 6x time = distance/speed So, travel time ...”
January 17, 2019
Brent@GMATPrepNow posted a reply to If Jake loses 8 pounds, he will weigh twice as much as his s in the Problem Solving forum
“Here''s a solution that uses one variable. Let x = Jake''s present weight in pounds So, x - 8 = Jake''s hypothetical weight IF he were to lose 8 pounds If Jake loses 8 pounds, he will weigh twice as much as his sister. In other words, the sister weighs HALF as much as Jake''s hypothetical ...”
January 17, 2019
Jay@ManhattanReview posted a reply to Sarah is in a room with 6 other children. If the other child in the Data Sufficiency forum
“Given: Ages of 6 children 2, 4, 5, 8, 10, and 13 years We have to determine whether Sarah is 7 years old. Let''s take each statement one by one. (1) The age of the fourth oldest child is equal to the average (arithmetic mean) of the seven children’s ages. Case 1: Say Sarah is 7 years ...”
January 17, 2019
Jay@ManhattanReview posted a reply to Which of the following lines is perpendicular to 4x+5y=9 in the Problem Solving forum
“Note that two lines are perpendicular to each other if the product of their slopes is 1. Let''s first find out the slope of the given line 4x + 5y = 9. Let''s transform it into y = mx + c form, where m is the slope of the line. Thus, 4x+5y=9 => y = (–4/5)x + 9. Thus, m = –4/5 Say the ...”
January 17, 2019
Brent@GMATPrepNow posted a reply to Three children, John, Paul, and Ringo, are playing a game. in the Problem Solving forum
“The main concept here is that all 3 children are equally likely to win this game (unless one of them possesses supernatural powers that allow him to know what numbers the other two boys will choose :-)) Also note that, if everything is random, the probability of winning by choosing the number 2 ...”
January 16, 2019
Brent@GMATPrepNow posted a new topic called In a barrel full of apples, 45% of the apples weigh more in the Problem Solving forum
“In a barrel full of apples, 45% of the apples weigh more than 81 grams, and 81% of the apples weigh less than 145 grams. What percent of the apples in the barrel weigh more than 81 grams but less than 145 grams? A) 16 B) 18 C) 26 D) 32 E) 36 Answer: C Difficulty level: 600 - 650 Source: ...”
January 16, 2019
Brent@GMATPrepNow posted a reply to What is the surface area of the solid right circular in the Problem Solving forum
“Given: radius = 3 Height = 10 Surface area of cylinder = 2πr² + 2πrh = 2π(3²) + 2π(3)(10) = 18π + 60π = 78π Answer: D Cheers, Brent”
January 16, 2019
Brent@GMATPrepNow posted a reply to Three children, John, Paul, and Ringo, are playing a game. in the Problem Solving forum
“This is one of my all-time favorite questions!! The main concept here is that all 3 children are equally likely to win this game (unless one of them possesses supernatural powers that allow him to know what numbers the other two boys will choose :-)) Also note that, if everything is random, ...”
January 16, 2019
Rich.C@EMPOWERgmat.com posted a reply to Mixture A is 15 percent alcohol, and mixture B is 50 percent in the Problem Solving forum
“Hi All, We''re told that Mixture A is 15 percent alcohol and mixture B is 50 percent alcohol and when a certain amount of each is poured together to create a 4-gallon mixture, the result contains 30 percent alcohol. We''re asked approximately how many gallons of mixture A are in the mixture. ...”
January 16, 2019
Rich.C@EMPOWERgmat.com posted a reply to Which of the following equations represents a line in the Problem Solving forum
“Hi All, We''re asked which of the 5 answers is the equation for a line that is perpendicular to line K in the figure above. This question is based on line/graphing rules. To start, a PERPENDICULAR line is one that has an "opposite inverse" slope (sometime called a "negative ...”
January 16, 2019
Rich.C@EMPOWERgmat.com posted a reply to If a certain concrete mixture contains gravel, water, and in the Problem Solving forum
“Hi All, We''re told that a certain concrete mixture contains gravel, water, and sand in a ratio of 1 to 3 to 5 by weight. We''re asked for the number of pounds of gravel that would be needed to produce 72 pounds of the mixture. This math behind this question can be approached in a number of ...”
January 16, 2019
Rich.C@EMPOWERgmat.com posted a reply to Need Suggestion on books in the GMAT Strategy forum
“Hi JOHNMC, Since it sounds like you''re just beginning your studies, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can take 2 for free at www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can ...”
January 16, 2019
Brent@GMATPrepNow posted a reply to GMAT Official Guide 2019 From 2000 to 2003, the number in the Problem Solving forum
“From 2000 to 2003, the number of employees at a certain company increased by a factor of 1/4 Let x = the number of employees in 2000 So, the number of employees in 2003 = x + (1/4)x = (5/4)x From 2003 to 2006, the number of employees at this company decreased by a factor of 1/3 (5/4)x = the ...”
January 16, 2019
Brent@GMATPrepNow posted a reply to The usual price of a bagel was reduced during a sale. How mu in the Data Sufficiency forum
“Target question: How much money could be saved by purchasing 10 bagels at the sale price rather than at the usual price? Statement 1: The usual price for a bagel is $0.50 per bagel. Since there''s no information about the SALE price, there''s no way to calculate the amount saved. Since we ...” January 16, 2019 Jay@ManhattanReview posted a reply to Mixture A is 15 percent alcohol, and mixture B is 50 percent in the Problem Solving forum “Say mixture A is x gallons and mixture B is y gallons. Thus, total amount of alcohol in the combined mixture = 15% of x + 50% of y = 0.15x + 0.5y Again, the amount of alcohol in the combined mixture = 30% of 4 = 1.2 gallons Thus, 0.15x + 0.5y = 1.2 We also know that x + y = 4. Tus, y = 4 ...” January 16, 2019 Jay@ManhattanReview posted a reply to What was the amount of money donated to a certain charity? in the Data Sufficiency forum “Let''s take each statement one by one. 1) Of the amount donated, 40 percent came from corporate donations. No information about the amount of donation. Insufficient. 2) Of the amount donated,$1.5 million came from noncorporate donations. No information about the amount of donation from ...”
January 16, 2019
Jay@ManhattanReview posted a reply to Tyler sells two types of milkshakes: chocolate and Oreo. in the Data Sufficiency forum
“Read a nice article that includes this question. Hope this helps! -Jay _________________ Manhattan Review Locations: Manhattan Review Tarnaka | GMAT Prep Madhapur | GRE Prep Kukatpally | Jayanagar GRE Coaching | and many more... Schedule your free consultation with an experienced GMAT ...”
January 16, 2019
Rich.C@EMPOWERgmat.com posted a reply to In a 200 member association consisting of men and women, exa in the Problem Solving forum
“Hi All, We''re told that in a 200 member association consisting of men and women, exactly 20% of men and exactly 25 % women are homeowners. We''re asked for the LEAST number of members who are homeowners. This question is built around a couple of Number Properties - and to MINIMIZE the number of ...”
January 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to Roger wants to arrange three of his five books on his in the Problem Solving forum
“Hi All, We''re told that Roger wants to arrange three of his five books on his bookshelf, but two of the five books are duplicates and cannot both be selected. We''re asked for the number different ways that Roger can arrange his books. The wording of this question is a bit ''quirky'', but the ...”
January 15, 2019
Brent@GMATPrepNow posted a reply to Henry eats X scones in X percent of the time it takes Rachel in the Problem Solving forum
“Let''s use the INPUT-OUTPUT approach. Let''s assign some values of X and Y so that they satisfy the information in the question. Let X = 25. This means Henry eats 25 scones in 25 percent of the time it takes Rachel to eat Y scones Let Y = 100. This means Henry eats 25 scones in 25 percent of ...”
January 15, 2019
Brent@GMATPrepNow posted a reply to Roger wants to arrange three of his five books on his in the Problem Solving forum
“I''m not crazy about this question. The official answer suggests that, although 2 books are DUPLICATES, they''re still considered DIFFERENT. Here''s what I mean: Let''s let D and d represent the two duplicate books. Let, A, B and C represent the other three books. The official answer ...”
January 15, 2019
Brent@GMATPrepNow posted a reply to The three-digit positive integer n can be written as ABC, in in the Data Sufficiency forum
“IMPORTANT point: The VALUE of a 3-digit integer xyz is 100x + 10y + z Example: 723 = (7)(100) + (2)(10) + 3 Target question: What is the remainder when n is divided by 37? Statement 1: A + B/10 + C/100 = B + C/10 + A/100 Multiply both sides by 100 to get: 100A + 10B + C = 100B + 10C + ...”
January 15, 2019
ceilidh.erickson posted a reply to GMATPaper : As measured by the Commerce in the Sentence Correction forum
“Hm, I''m inclined to think that the sentence would NOT work as you suggested: ... corporate profits peaked in the fourth quarter of 1988 but they have slipped since then The word "peaked" already implies that it was a high point, naturally followed by lower values. The contrast word ...”
January 15, 2019
ceilidh.erickson posted a reply to At the end of the first quarter, the share price of a in the Problem Solving forum
“Calculating the correct answer isn''t difficult, as Brent demonstrated. However, savvy GMAT test takers will always try to use logic to eliminate answer choices before they even start calculating! The student who isn''t reading carefully might think "up 20%... then up 50%... that''s a ...”
January 15, 2019
ceilidh.erickson posted a reply to In a certain bathtub, both the hot and cold water fixtures in the Problem Solving forum
“We can easily use logic to get the correct answer, without doing any calculations. In WORK rate problems, when two machines / faucets / people, etc, work together, a) they work at the SUM of their respective rates, and b) the time that it takes them to complete the task together is LESS than ...”
January 15, 2019
ceilidh.erickson posted a reply to Every day in the morning Ross cycles for 2 hours. He always in the Problem Solving forum
“You could also avoid calculation and easily estimate your way to the correct answer to save time on this problem. As Mitch demonstrated, 1 mile per 12 min --> 5 miles per hr for the first part of the trip. If Ross rides at half the speed for the return trip, then the overall average speed ...”
January 15, 2019
ceilidh.erickson posted a reply to In a 200 member association consisting of men and women, exa in the Problem Solving forum
“OP, are you sure this is an OG question? Which edition of the OG did you get this problem from? It''s not in any edition I own. A google search yields only 1 post from gmatclub, and 3 posts on this forum - all posted by you in the last month. The wording of this problem does not sound like an OG ...”
January 15, 2019
Jay@ManhattanReview posted a reply to Twenty people at a meeting were born during the month of in the Problem Solving forum
“Probability that at least two people sharing the same birthday = 1 – E Hope this helps! -Jay _________________ Manhattan Review Locations: Manhattan Review Jayanagar | GMAT Prep Tarnaka | GRE Prep Madhapur | Kukatpally GRE Coaching | and many more... Schedule your free consultation ...”
January 15, 2019
Brent@GMATPrepNow posted a reply to If x, y are integers, is x^2+x+y an odd integer? in the Data Sufficiency forum
“ Given: x and y are integers Target question: Is x² + x + y an odd integer? This is a good candidate for rephrasing the target question. Take x² + x + y and factor the first two terms to get: x(x + 1) + y Notice that x and x+1 are CONSECUTIVE INTEGERS, which means one value is ODD and ...”
January 15, 2019
Jay@ManhattanReview posted a reply to How many hours did it take Helen to drive from her house to in the Data Sufficiency forum
“Say the distance from Helen''s home to her parent''s house is d kilometers. We have to get the value of d. Let''s take each statement one by one. 1) Helen''s average speed on this trip was 72 kilometers per hour. => time taken by Helen = d/72 hours. Can''t get the value of d. ...”
January 15, 2019
Jay@ManhattanReview posted a reply to The cost of a square slab is proportional to its thickness a in the Data Sufficiency forum
“Say the cost of the slab is C, thickness is T and length is L. It is given C is proportional to T and square of L. Say a constant is K. Thus, C = KTL^2 We are given that T = 0.1 meter, and L = 3 meters Thus, C = K*0.1*3^2 C = 0.9K If we get the value of K, we get the answer. ...”
January 15, 2019
Jay@ManhattanReview posted a reply to Which of the following CANNOT result in an integer? A. The in the Problem Solving forum
“Let''s take each option one by one. A. The product of two integers divided by the reciprocal of a different integer Say the three integers x, y and z. Thus, xy/(1z) = xyz. Product of three integers is always an integer. Option A can''t be the correct option. B. An even integer divided by ...”
January 15, 2019
Brent@GMATPrepNow posted a reply to In a 200 member association consisting of men and women, exa in the Problem Solving forum
“In order to minimize the number of homeowners, we must MAXIMIZE the number of men in the group, since the proportion of male homeowners (20%) is less than the proportion of female homeowners (25%) So, let''s see what happens if there are 199 men and 1 woman. If 20% (aka 1/5) of the men are ...”
January 15, 2019
Rich.C@EMPOWERgmat.com posted a reply to Probability question in the Problem Solving forum
“Hi yenngoc2409, I''m going to give you a hint so that you can adjust your calculation. Your result is too high because you have not accounted for the ''duplicate'' entries. For example, if the 4 cards were 2233, then you have an option that has two pair... but you also have two of the options ...”
January 14, 2019
Brent@GMATPrepNow posted a reply to Three machines have equal constant work rates. It takes h + in the Problem Solving forum
“ It takes h + 3 hours to produce 360 toys when 2 machines work together So, during those h + 3 hours, EACH machine makes 180 toys So, ONE machine can produce 180 toys in h + 3 hours rate = output/time So, we can write: rate of ONE machine = 180/(h + 3) It takes h hours to produce 360 toys ...”
January 14, 2019
Jay@ManhattanReview posted a reply to If Jay has 99 problems, in how many ways can he select k of in the Data Sufficiency forum
“Note that unlike Permutation, in case of the combination, nCr = nC(n–r). Thus, we do not always get the unique value of r. Let''s take an example. • Number of ways of choosing 3 things out of 4 = 4C3 = (4.3.2)/(1.2.3) = 4; and • Number of ways of choosing 1 thing out of 4 = 4C1 = 4 ...”
January 14, 2019
Jay@ManhattanReview posted a reply to m is a multiple of 13. Is mn a multiple of 195? in the Data Sufficiency forum
“Given that m is a multiple of 13, we have m = 13k, where k is any integer. If mn a multiple of 195, mn = 195p, where p is any integer. mn = 195p => 13kn = 195p => n = 195p/13k = 15p/k. => n = 15p/k Let''s take each statement one by one. (1) n has every factor that 45 has. ...”
January 14, 2019
Jay@ManhattanReview posted a reply to If set S consists of the numbers 1, 5, -2, 8, and n, is 0 &l in the Data Sufficiency forum
“Given: Set S: {–2, 1, 5, 8, n} Question; Is 0 < n < 7 ? Let''s take each statement one by one. (1) The median of the numbers in S is less than 5. Case 1: Considering n ≤ 0. Say n = –3 => Set S: : {–3, –2, 1, 5, 8}. Median = 1 < 5. The answer is No. Case 2: ...”
January 14, 2019
Rich.C@EMPOWERgmat.com posted a reply to CARS in the Problem Solving forum
“Hi All, We''re told that the number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively and that the sixth car through the production line has either 3, 7, or 12 defects. We''re asked which of the following three values does the MEAN ...”
January 13, 2019
Rich.C@EMPOWERgmat.com posted a reply to GMAT Help Required.. 4 months to go.. diag 540 (38/27) in the GMAT Strategy forum
“Hi amg0410, To start, a 540 is a solid initial CAT Score (the average Score on the Official GMAT hovers around 550 most years). Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on your timeline and your goals: ...”
January 13, 2019
Rich.C@EMPOWERgmat.com posted a reply to Carlos runs a lap around the track in x seconds. His second in the Problem Solving forum
“Hi All, We''re told that Carlos runs a lap around the track in X SECONDS. His second lap is five SECONDS SLOWER than the first lap, but the third lap is two SECONDS FASTER than the first lap. We''re asked for Carlos’s average (arithmetic mean) number of MINUTES per LAP, in terms of X. This ...”
January 12, 2019
Rich.C@EMPOWERgmat.com posted a reply to Patricia builds two triangles, each with 30 feet of wood. in the Problem Solving forum
“Hi All, We''re told that Patricia builds two triangles, EACH with 30 feet of wood. The first triangle ABC is built to maximize the LENGTH of the BASE side. The second triangle DEF is built to maximize the AREA of the triangle. In addition, the lengths of all line segments are INTEGERS. We''re ...”
January 12, 2019
Rich.C@EMPOWERgmat.com posted a reply to I took the GMAT today in the GMAT Strategy forum
“Hi mbaorbust3, I''m sorry to hear that Test Day did not go as well as hoped. Business Schools generally don''t care if you retake the GMAT though, so you have little to worry about in that regard. Before we can discuss how you might improve this next phase of your studies, it would help if you ...”
January 12, 2019
ceilidh.erickson posted a reply to Admissions cosultants in the The Application Process forum
“It looks like BTG has added that feature since you posted: https://reviews.beatthegmat.com/ You should also check out Poets & Quants: https://poetsandquants.com/2018/04/27/best-mba-admission-consultants/ https://poetsandquants.com/consultants/”
January 12, 2019
ceilidh.erickson posted a reply to 60Day GMAT PREP Question in the GMAT Strategy forum
“Studying without reviewing is almost entirely useless - it''s like trying to collect water with a sieve. Or trying to collect tennis balls like this: https://www.youtube.com/watch?v=L5C8rnpAbIs It is absolutely essential that you make reviewing a large part of your process. In fact, you should ...”
January 12, 2019
ceilidh.erickson posted a reply to Post-First Exam: What are my next steps? in the GMAT Strategy forum
“You mention that you''ve read most of the guides and done practice problems. There are a few things you haven''t mentioned, though: - how were you doing those practice problems? Were you doing them timed, and carefully tracking your errors? - do you have a solid understanding of test strategy as ...”
January 12, 2019
ceilidh.erickson posted a reply to Over the last five years, demand for hotel rooms in Cenopoli in the Critical Reasoning forum
“If we want to EVALUATE an argument, we need to establish the conclusion of the argument and its supporting premises. We then need to determine what information is MISSING. Premises: - demand for hotel rooms in Cenopolis has increased significantly - so has the average price Cenopolis hotels ...”
January 12, 2019
ceilidh.erickson posted a reply to Bluegrass musician Bill Monroe, whose repertory, views on in the Sentence Correction forum
“The reason "that of" redundant is that in the non-underlined portion we have "his own," which is already possessive. (This is similar to saying "my music of mine.") Since we can''t change that non-underlined part, none of the fixes you suggested would work for this ...”
January 12, 2019
ceilidh.erickson posted a reply to People with high blood pressure are generally more nervous a in the Critical Reasoning forum
“For more on how the GMAT tests correlation v. causation, see: https://www.beatthegmat.com/male-bowerbirds-construct-elaborately-decorated-nests-or-t303937.html#818930 https://www.beatthegmat.com/veritas-cat-question-doubt-t300364.html#808487 ...”
January 12, 2019
ceilidh.erickson posted a reply to People with high blood pressure are generally more nervous a in the Critical Reasoning forum
“This argument demonstrates a very common logical flaw: CORRELATION v. CAUSATION. We''re given that "people with high blood pressure are generally more nervous and anxious than people who do not have high blood pressure." In other words, these two phenomena tend to occur together. ...”
January 12, 2019
ceilidh.erickson posted a reply to Researchers have found entombed in Burmese amber a 102-milli in the Sentence Correction forum
“This question is primarily testing MODIFIERS and LOGICAL PARALLELISM. Researchers have found entombed in Burmese amber a 102-million-year-old tick grasping the feather of a Velociraptor, providing the first direct evidence that the tiny pests drank dinosaur blood. (A) entombed in Burmese ...”
January 12, 2019
ceilidh.erickson posted a reply to A new commercial radio station in Greenfield plans to play s in the Critical Reasoning forum
“The chain of logic in this argument is as follows: play songs that were popular hits fifteen to twenty-five years ago --> attract an audience made up mainly of people between thirty-five and forty-five years old --> strong market appeal to advertisers. This argument is relying on the ...”
January 12, 2019
ceilidh.erickson posted a reply to I took the GMAT today in the GMAT Strategy forum
“I''m so sorry to hear that. But you''re not alone - this test is hard, and many people don''t get the score they''re hoping for on the first try. Here are some possible explanations for why your score went down: 1. You were emphasizing content over strategy (esp timing strategy) You said ...”
January 12, 2019
Brent@GMATPrepNow posted a reply to There is a total of 120 marbles in a box, each of which is in the Problem Solving forum
“...the probability that it So, 1/4 of the 120 marbles are white. In other words, there are 30 white marbles. ...the probability that it So, 1/3 of the 120 marbles are green . In other words, there are 40 green marbles. Altogether, there are 70 marbles that are EITHER white or green. ...”
January 12, 2019
Brent@GMATPrepNow posted a reply to To furnish a room in model home, an interior decorator is to in the Problem Solving forum
“Total # of combinations = (# of ways to select 2 chairs)(# of ways to select 2 tables) So, 150 = (# of ways to select 2 chairs)(# of ways to select 2 tables) # of ways to select 2 chairs 5 tables, choose 2 of them. Since the order of the selected chairs does not matter, we can use ...”
January 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to In a certain bathtub, both the hot and cold water fixtures in the Problem Solving forum
“Hi All, We''re told that In a certain bathtub, both the hot and cold water fixtures leak. The cold water leak alone would fill an empty bucket in C hours, and the hot water leak alone will fill the same bucket in H hours, where C < H. If both fixtures began to leak at the same time into the ...”
January 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to The following tables show the revenues and costs, in in the Problem Solving forum
“Hi All, We''re told that Profit = Revenue - Costs and that costs will remain constant from 2007 to 2008, while revenues INCREASE by 10% in that same period. We''re asked for the percent increase in PROFITS from 2007 to 2008. This question comes down to some Arithmetic and the Percentage Change ...”
January 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to A class consists of 12 girls and 20 boys. One quarter of the in the Problem Solving forum
“Hi All, We''re told that a class consists of 12 girls and 20 boys. One-quarter of the girls in the class have blue eyes. We''re asked for the probability that a randomly selected child is a girl who does NOT have blue eyes. This question comes down to some basic organization and Arithmetic. ...”
January 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to Guidance on study plan in the GMAT Strategy forum
“Hi szhao, To start, a 730 initial Score is an outstanding performance (the average Score on the Official GMAT hovers around 550 most years), so you''re clearly a strong critical thinker. Focusing on the GMAT now - years before you will actually need your Score - is also a smart choice. Since ...”
January 11, 2019
Brent@GMATPrepNow posted a reply to At a certain fruit stand, the price of each apple is 40 in the Problem Solving forum
“It turns out that the cost per apple is irrelevant. Here''s why: The average (arithmetic mean) price of the 10 pieces of fruit is 56 cents So, (total value of all 10 pieces of fruit)/10 = 56 cents This means, total value of all 10 pieces of fruit = 560 cents How many oranges must Mary put ...”
January 11, 2019
Brent@GMATPrepNow posted a reply to A librarian has a set of ten books, including four different in the Problem Solving forum
“Take the task of arranging the 10 books and break it into stages. Stage 1: Arrange the 4 books about Abe Lincoln in a row We can arrange n objects in n! ways. So, we can arrange the 4 books in 4! ways IMPORTANT: Now we''ll "glue" the 4 Abe Lincoln books together to form 1 SUPER ...”
January 11, 2019
Brent@GMATPrepNow posted a reply to By what percent is 25 greater than 15? in the Problem Solving forum
“An alternative approach is to test the answer choices First, however, we can eliminate some answer choices by first testing an easy value: 50% Is 25 50% greater than 15? Well, 50% of 15 = 7.5 So, 50% greater than 15 = 15 + 7.5 = 22.5 22.5 is too small (we need to get 25), so we need a ...”
January 11, 2019
Jay@ManhattanReview posted a reply to At a certain fruit stand, the price of each apple is 40 in the Problem Solving forum
“Say Mary x numbers of apples and y numbers of oranges. Thus, x +y = 10 and 40x + 60y = 56*10 40x + 60y = 560 Say Mary put back p numbers of oranges, thus, we have 40x + 60y – 60 p = 52(10 – p) 560 – 60 p = 520 – 52p p = 5. The correct answer: E Hope this helps! -Jay ...”
January 11, 2019
Jay@ManhattanReview posted a reply to In a certain bathtub, both the hot and cold water fixtures in the Problem Solving forum
“Say c = 10 hours and h = 20 hours since it is given that c < h. Thus, we have 1/c + 1/h = 1/t 1/10 + 1/20 = 1/h h = 20/3 = 6.67 hours Let''s see the statements: I. 0 < t < h: 0 < 6.67 < 20. This is correct. II. c < t < h: 10 > 6.66 < 20. This is not ...”
January 11, 2019
Jay@ManhattanReview posted a reply to By what percent is 25 greater than 15? in the Problem Solving forum
“25 is greater than 15 by 10 (= 25 – 15). Thus, 25 is greater than 15 by (10/15)*100% = 66 2/3%. The correct answer: E Hope this helps! -Jay _________________ Manhattan Review Locations: Manhattan Review Chennai | GMAT Prep Himayatnagar | GRE Prep Hyderabad | Bangalore GRE Coaching | ...”
January 11, 2019