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 ...”
Today
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 ...”
Today
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, ...”
Today
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 ...”
Today
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”
Today
Max@Math Revolution posted a new topic called A = (2-3+4)^{11}, and B = (-2+3-4)^{11}. What is the value o in the Problem Solving forum
“[Math Revolution GMAT math practice question] A = (2-3+4)^{11}, and B = (-2+3-4)^{11}. What is the value of 2^{A+B}? A. 1/2048 B. 1/1024 C. 1 D. 1024 E. 2048”
Today
Max@Math Revolution posted a new topic called If y=|x-1|+|x+1|, then y=? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If y=|x-1|+|x+1|, then y=? 1) x > -1 2) x < 1”
Today
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 ...” Yesterday 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 ...” Yesterday 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. --|--------------|----| ...” Yesterday 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 ...” Yesterday 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 ...” Yesterday 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 ...” Yesterday 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 ...” Yesterday 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 ...” Yesterday 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. ...” Yesterday 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 ...” Yesterday 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 - ...” Yesterday 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 ...” Yesterday 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 ...” Yesterday 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 ...” Yesterday Max@Math Revolution posted a new topic called If x-2y=4, then x^2-4xy+4y^2-x+2y=? in the Problem Solving forum “[Math Revolution GMAT math practice question] If x-2y=4, then x^2-4xy+4y^2-x+2y=? A. 12 B. 16 C. 20 D. 24 E. 28” Yesterday Max@Math Revolution posted a new topic called n is a 3 digit integer of the form ab6. Is n divisible by 4? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] n is a 3 digit integer of the form ab6. Is n divisible by 4? 1) a+b is an even integer 2) ab is an odd integer.” Yesterday Max@Math Revolution posted a reply to 32 teams compete in the World Cup of Soccer. They are divid in the Problem Solving forum “=> Each group plays 4C2 = 6 games and we have 8 groups. Thus, the group stage includes 6*8 = 48 games. Therefore, the answer is C. Answer: C” Yesterday Max@Math Revolution 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 d and v be the distance the boat travels and the speed of the river flow, respectively. The time the boat takes to travel up the river is d / ( 5v – v ) = d/4v. The time the boat takes to travel down the river is d / ( 5v + v ) = d/6v. Let p be the percentage are looking for. ...” Yesterday Max@Math Revolution posted a reply to Is ab < 0? in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” Yesterday Max@Math Revolution posted a reply to A sequence An satisfies An+3=An+8. What is the remainder whe in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” Yesterday 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 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 Max@Math Revolution posted a new topic called 32 teams compete in the World Cup of Soccer. They are divid in the Problem Solving forum “[Math Revolution GMAT math practice question] 32 teams compete in the World Cup of Soccer. They are divided into eight groups of four teams (groups A to H) to compete in the ‘group stage’. Teams in each group play one another in a round-robin competition, with the top two teams of each group ...” January 18, 2019 Max@Math Revolution posted a reply to If the median and the range of the data set 1, 1, 2, 2, 3, 3 in the Problem Solving forum “=> If 3 ≤ m ≤ 4, then the median is 3 and the range of the data is 3. Thus, any number between 3 and 4, inclusive, is possible. If 2 ≤ m < 3, then the median is m and the range of the data is 3. Thus, there is no possible value of m in the interval 2 ≤ m < 3. If m < 2, then ...” January 18, 2019 Max@Math Revolution posted a new topic called Is ab < 0? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] Is ab < 0? 1) |a+b| = - ( a + b ) 2) |a+b| + 1 = |a| + |b|” January 18, 2019 Max@Math Revolution posted a reply to If x and y are integers, is x^2-y^2 an even integer? in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” 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 Max@Math Revolution posted a new topic called The speed of a boat is 5 times the speed at which a river fl in the Problem Solving forum “[Math Revolution GMAT math practice question] The speed of a boat is 5 times the speed at which a river flows. What percent of the time it takes for the boat to travel down the river (i.e. in the same direction as the river flow) does it take for the boat to travel up the river? A. 50% ...” January 17, 2019 Max@Math Revolution posted a reply to A rectangular wall has dimensions of 800 by 300. If the wall in the Problem Solving forum “=> Now, 800 / 25 = 32 and 300 / 12 = 25. Thus, the number of tiles required is 32 * 25 = 800. Therefore, the answer is E. Answer: E” January 17, 2019 Max@Math Revolution posted a new topic called A sequence An satisfies An+3=An+8. What is the remainder whe in the Data Sufficiency forum “n satisfies An+3=An+8. What is the remainder when A99 is divided by 8? 1) A1=1 2) A2=2” January 17, 2019 Max@Math Revolution posted a reply to If x, y are integers, is x^2+x+y an odd integer? in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” 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
Max@Math Revolution posted a new topic called If the median and the range of the data set 1, 1, 2, 2, 3, 3 in the Problem Solving forum
“[Math Revolution GMAT math practice question] If the median and the range of the data set 1, 1, 2, 2, 3, 3, 4, 4, m are the same, which of the following could be the value of m? A. -1 B. 0 C. 1 D. 2 E. 3”
January 16, 2019
Max@Math Revolution posted a reply to Three machines have equal constant work rates. It takes h + in the Problem Solving forum
“=> The work rate for each machine is given by 360 / {2(h+3)} = 180 / ( h + 3 ). Another expression for this work rate is 360 / (3h) = 120 / h. Thus, 180 / ( h + 3 ) = 120 / h or 3 / ( h + 3 ) = 2 / h. So, 3h = 2(h+3) and h = 6. The sum of the work rates of the 3 machines is 360 / 6 = 60. ...”
January 16, 2019
Max@Math Revolution posted a new topic called If x and y are integers, is x^2-y^2 an even integer? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If x and y are integers, is x^2-y^2 an even integer? 1) x^3-y^3 is an even integer 2) x+y is an even integer”
January 16, 2019
Max@Math Revolution posted a reply to Is a > b - c? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 16, 2019
Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum
“To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...”
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
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
Max@Math Revolution posted a new topic called A rectangular wall has dimensions of 800 by 300. If the wall in the Problem Solving forum
“[Math Revolution GMAT math practice question] A rectangular wall has dimensions of 800 by 300. If the wall is tiled using tiles measuring 12 x 25 of the same units, how many tiles are used? A. 360 B. 400 C. 500 D. 600 E. 800”
January 15, 2019
Max@Math Revolution posted a new topic called If x, y are integers, is x^2+x+y an odd integer? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If x, y are integers, is x^2+x+y an odd integer? 1) x is an odd integer 2) y is an odd integer”
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
Max@Math Revolution posted a new topic called Three machines have equal constant work rates. It takes h + in the Problem Solving forum
“[Math Revolution GMAT math practice question] Three machines have equal constant work rates. It takes h + 3 hours to produce 360 toys when 2 machines work together, and it takes h hours to produce 360 toys when 3 machines work together. How many toys can each machine produce per hour when working ...”
January 14, 2019
Max@Math Revolution posted a new topic called Is a > b - c? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] Is a > b - c? 1) |c-b| < a 2) a, b, and c are the lengths of the 3 sides of a triangle.”
January 14, 2019
Max@Math Revolution posted a reply to n is a product of 6 distinct prime numbers. m!/n is an integ in the Problem Solving forum
“=> The smallest product of 6 distinct prime numbers is n = 2*3*5*7*11*13. 13! Is the smallest factorial that is divisible by 2*3*5*7*11*13. Thus, the smallest possible integer value of m is 13. Therefore, the answer is D. Answer: D”
January 14, 2019
Max@Math Revolution posted a reply to (7+43+7-43)^2 is equal to which of the following? in the Problem Solving forum
“=> You should recall two properties about nested radicals: $$\sqrt{a+b+2\sqrt{ab}}=\sqrt{a}+\sqrt{b}$$ , $$\sqrt{a+b-2\sqrt{ab}}=\sqrt{a}-\sqrt{b}$$ , where a > b. Together, these yield $$\left(\sqrt{7+4\sqrt{3}}+\sqrt{7-4\sqrt{3}}\right)^2$$ ...”
January 14, 2019
Max@Math Revolution posted a reply to In the xy-plane, a circle has center (0,0) and radius 5. Is in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 14, 2019
Max@Math Revolution posted a reply to x, y and z are the sides of the triangle shown and h is its in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
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
Max@Math Revolution posted a new topic called n is a product of 6 distinct prime numbers. m!/n is an integ in the Problem Solving forum
“[Math Revolution GMAT math practice question] n is a product of 6 distinct prime numbers. m!/n is an integer. What is the smallest possible value of m? A. 10 B. 11 C. 12 D. 13 E. 14”
January 11, 2019
Max@Math Revolution posted a reply to What is the difference between the sum of all even integers in the Problem Solving forum
“=> ( 52 + 54 + … + 100 ) – ( 2 + 4 + … + 50 ) = ( 52 – 2 ) + ( 54 – 4 ) + … + ( 100 – 50 ) = 50 + 50 + … + 50 = 50 * 25 = 1250. Therefore, the answer is A. Answer: A”
January 11, 2019
Max@Math Revolution posted a new topic called In the xy-plane, a circle has center (0,0) and radius 5. Is in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] In the xy-plane, a circle has center (0,0) and radius 5. Is the point (r,s) inside or on the circle? 1) -3 < r < 3 2) -4 < s < 4”
January 11, 2019
Max@Math Revolution posted a reply to If x and y are positive, is x > y? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 11, 2019
Rich.C@EMPOWERgmat.com posted a reply to The price of a phone call consists of a standard connection in the Problem Solving forum
“Hi All, We''re told that the price of a phone call consists of a standard connection fee, which is constant, plus a per minute charge, a 10-minute call costs $2.90 and a 16-minute call costs$4.40. We''re asked for the cost of a 13-minute call. This question can be solved in a couple of ...”
January 10, 2019
Rich.C@EMPOWERgmat.com posted a reply to This year, x people won an Olympic medal for water in the Problem Solving forum
“Hi All, This question can be solved by TESTing VALUES (and taking a few notes). We''re told that X people won a medal for water competitions. Of those X people, 1/3 won a medal for swimming; of those who won a medal for SWIMMING, 1/4 also won a medal for diving. The common denominator ...”
January 10, 2019
Brent@GMATPrepNow posted a reply to The price of a phone call consists of a standard connection in the Problem Solving forum
“Let C = price of connection fee Let M = the price PER MINUTE A 10-minute call costs $2.90 We can write: C + 10M = 2.90 A 16-minute call costs$4.40. We can write: C + 16M = 4.40 How much does a 13-minute call cost? So far, we have: C + 10M = 2.90 C + 16M = 4.40 ONE (slower) ...”
January 10, 2019
Brent@GMATPrepNow posted a reply to At the end of the first quarter, the share price of a in the Problem Solving forum
“Let $100 = share price at the beginning of the year At the end of the first quarter, the share price of a certain mutual fund was 20 percent higher than it was at the beginning of the year. So,$120 = share price at the end of the first quarter At the end of the second quarter, the share ...”
January 10, 2019
Brent@GMATPrepNow posted a reply to Bite-sized video lessons from GMAT Prep Now in the GMAT Math forum
“Data Sufficiency Video #1: Introduction to GMAT Data Sufficiency Video: https://www.youtube.com/watch?v=3MaEqnSnK-s Cheers, Brent”
January 10, 2019
Brent@GMATPrepNow posted a reply to 17^27 has a units digit of: in the Problem Solving forum
“Look for a pattern 17^1 = 17 17^2 = (17)(17) = ---9 17^3 = (17)(17^2) = (17)(---9) = ----3 17^4 = (17)(17^3) = (17)(---3) = ----1 17^5 = (17)(17^4) = (17)(---1) = ----7 NOTICE that we''re back to where we started. 17^5 has units digit 7, and 17^1 has units digit 7 So, at this point, ...”
January 10, 2019
Max@Math Revolution posted a new topic called (7+43+7-43)^2 is equal to which of the following? in the Problem Solving forum
“$$\left(\sqrt{7+4\sqrt{3}}+\sqrt{7-4\sqrt{3}}\right)^2$$ is equal to which of the following? A. 32 B. 30 C. 24 D. 16 E. 12”
January 10, 2019
Max@Math Revolution posted a reply to x is a positive integer, and the units digits of both (x+2)^ in the Problem Solving forum
“=> Since x is a positive integer and the units digits of both (x+2)^2 and (x-2)^2 are 9, the units digits of x+2 and x-2 must be 7 and 3, respectively. Thus, the units digit of x is 5. Therefore, the answer is C. Answer: C ”
January 10, 2019
Max@Math Revolution posted a new topic called x, y and z are the sides of the triangle shown and h is its in the Data Sufficiency forum
“https://i.postimg.cc/CBG3d0W7/1-10.png”
January 10, 2019
Max@Math Revolution posted a reply to If x is integer and 3 | x |+x < 4, what is the value of x in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 10, 2019
Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum
“To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...”
January 10, 2019
Rich.C@EMPOWERgmat.com posted a reply to How many integers between in the Problem Solving forum
“Hi All, This question is essentially about arithmetic and taking the proper notes. You can go about the math steps in a couple of different ways though - depending on how you ''see'' this information. From the prompt, we know that the farmer spent $35 on feed.... 40% of his money on chicken ...” January 10, 2019 Rich.C@EMPOWERgmat.com posted a reply to Stock - Number of shares V ------------------- 68 W ------- in the Problem Solving forum “Hi All, "Range" questions come from the broader category of statistics, which will show up a couple of times on the GMAT. The range of a group of numbers is the difference between the largest number and the smallest number. Based on the original number of shares, the range would ...” January 10, 2019 Rich.C@EMPOWERgmat.com posted a reply to The water from one outlet, flowing at a constant rate, can f in the Problem Solving forum “Hi All, This question is a standard "Work Formula" question. When you have 2 entities sharing a task, you can use the following formula to figure out how long it takes for the 2 entities to complete the task together. Work = (A)(B)/(A+B) where A and B are the individual times ...” January 10, 2019 Rich.C@EMPOWERgmat.com posted a reply to The architects of a certain type of building estimate in the Problem Solving forum “Hi All, We''re told that the architects of a certain type of building estimate construction costs to be$2.0 million per floor for each of the first 5 floors, $2.5 million per floor for each of the next 3 floors, and$3.5 million per floor for any additional floors. We''re asked what the ...”
January 10, 2019
Brent@GMATPrepNow posted a reply to The water from one outlet, flowing at a constant rate, can f in the Problem Solving forum
“One approach is to assign a NICE NUMBER to the volume of the swimming pool. This number will work well with the two pieces of information (fill pool in 9 hours and fill pool in 5 hours). So, let''s say that the volume of the pool is 45 gallons. The water from one outlet, flowing at a constant ...”
January 9, 2019
Brent@GMATPrepNow posted a reply to If x and y are positive, is x > y? in the Data Sufficiency forum
“Target question: Is x > y? This is a good candidate for rephrasing the target question. Since y is POSITIVE, we can safely take the inequality x > y and divide both sides by y to get: x/y > 1 REPHRASED target question: Is x/y > 1? Aside: Here’s a video with tips on rephrasing ...”
January 9, 2019
Brent@GMATPrepNow posted a reply to Emily keeps 12 different pairs of shoes (24 individual shoes in the Problem Solving forum
“P(dog selects matching pair) = P(dog chooses ANY sock 1st AND 2nd sock matches the 1st sock) = P(dog chooses ANY sock 1st) x P(2nd sock matches the 1st sock) = 24/24 x 1/23 = 1/23 Answer: C Cheers, Brent”
January 9, 2019
Max@Math Revolution posted a new topic called What is the difference between the sum of all even integers in the Problem Solving forum
“[Math Revolution GMAT math practice question] What is the difference between the sum of all even integers between 51 and 100 (inclusive) and the sum of all even integers between 1 and 50 (inclusive)? A. 1,250 B. 2,000 C. 2,500 D. 3,750 E. 5,000”
January 9, 2019
Max@Math Revolution posted a reply to If f(a*b) = f(a) + f(b), what is the value of f(1)? in the Problem Solving forum
“=> Since 1 = 1 * 1, setting a = 1 and b = 1 yields f(1) = f(1*1) = f(1) + f(1) and f(1) = 2f(1), which is equivalent to f(1) = 0. Therefore, the answer is C. Answer: C”
January 9, 2019
Max@Math Revolution posted a new topic called If x and y are positive, is x > y? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If x and y are positive, is x > y? 1) 2x > 3y 2) -5x < -7y”
January 9, 2019
Max@Math Revolution posted a reply to If x ≠ y, what is the value of ( x^2y – xy^2 ) / ( x^3 in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 9, 2019
Brent@GMATPrepNow posted a reply to On a certain Monday, Carlos drove to work at an average in the Problem Solving forum
“Average speed = (TOTAL distance)/TOTAL travel time)Carlos drove to work at an average speed of 50 miles per hour Time = distance/speed So, travel time TO work = d/50 hours Carlos drove home from work at an average speed of 70 miles per hour So, travel time FROM work = d/70 hours So, TOTAL ...”
January 8, 2019
Brent@GMATPrepNow posted a reply to How many integers between in the Problem Solving forum
“He spent 40% (of the $35) on chicken feed. 40% of$35 = $14. So, he spent$14 on chicken feed. He got a 20% discount on the chicken feed. In other words, he paid 80% of the original price. So, let C = original price of chicken feed. We can write 80% of C = $14 Or we can write 0.8C =$14 ...”
January 8, 2019
Brent@GMATPrepNow posted a reply to On Monday, the opening price of a certain stock was $100 in the Problem Solving forum “On Monday, the opening price of a certain stock was$100 per share and its closing price was $110 per share. On Tuesday the closing price of the stock was 10 percent less than its closing price on Monday, We can say that the stock LOST 10% of its value. OR we can say that the stock RETAINED 90% ...” January 8, 2019 Rich.C@EMPOWERgmat.com posted a reply to Sumanta needs to type up her 1950-word paper by its 5 pm in the Problem Solving forum “Hi All, This question can be solved by TESTing THE ANSWERS. This is essentially a rate question, but the rate (and the time spent at that rate) changes depending on what time Rachel begins typing. Based on the information in the prompt, we know that if Rachel begins typing at 3pm, then she ...” January 8, 2019 Rich.C@EMPOWERgmat.com posted a reply to In the first round of the elections, the only two candidates in the Problem Solving forum “Hi All, We''re told that in the first round of the elections, the only two candidates got exactly the SAME number of votes and during the second round, 15,000 votes switched from the first candidate to the second one. We''re also told that the total number of votes remained the same in both ...” January 8, 2019 Brent@GMATPrepNow posted a reply to A department manager distributed a number of pens, pencils, in the Data Sufficiency forum “Jay''s solution is great. I just wanted to mention that this question hinges largely on the fact that the number of pens, pencils, and pads that each staff member receives MUST HAVE INTEGER VALUES. So, for example, if statement 1 were different and statement 2 read "The manager ...” January 8, 2019 Brent@GMATPrepNow posted a reply to In 1982 and 1983, Company B's operating expenses were$12.0 in the Problem Solving forum
“The profit in 1982 = 15.6 - 12.0 = $3.6 million The profit in 1983 = 18.8 - 14.0 =$4.8 million Percent change = (100)(new - old)/old = (100)(4.8 - 3.6)/3.6 = (100)(1.2)/(3.6) = (100)(1/3) = 33 1/3% Answer: D Cheers, Brent”
January 8, 2019
Brent@GMATPrepNow posted a reply to x is a positive integer, and the units digits of both (x+2)^ in the Problem Solving forum
“Another approach is to test the answer choices A. If the units digit of x is 1, is it the case that units digits of both (x+2)² and (x-2)² is 9? Well, (x+2)² = (1+2)² = 9. Works! To test (x-2)², let''s let x = 11. We get: (11-2)² = 9² = 81. NO GOOD ELIMINATE A B. If the units digit ...”
January 8, 2019
Max@Math Revolution posted a new topic called x is a positive integer, and the units digits of both (x+2)^ in the Problem Solving forum
“[Math Revolution GMAT math practice question] x is a positive integer, and the units digits of both (x+2)^2 and (x-2)^2 are 9. What is the units digit of x？ A. 1 B. 3 C. 5 D. 7 E. 9”
January 8, 2019
Max@Math Revolution posted a new topic called If x is integer and 3 | x |+x < 4, what is the value of x? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If x is integer and 3 | x |+x < 4, what is the value of x? 1) x < 0 2) x > -2”
January 8, 2019
Rich.C@EMPOWERgmat.com posted a reply to What is the value of 25*8÷50÷2 in the Problem Solving forum
“Hi All, We''re asked for the value of 25*8÷50÷2. This question involves rules called "Order of Operations", but as long as you know those rules, the work here isn''t too difficult. In Order of Operations, both multiplication and division are on the same ''level'' (meaning that you ...”
January 8, 2019
Rich.C@EMPOWERgmat.com posted a reply to HELP!!! Very POOR VERBAL score. in the Suggestions and Feedback forum
“Hi Linda, Training to score at a high level on the GMAT often requires more than just ''weekend study'', so if you can put in a little study time during the week (even if it''s just an hour a day), then that would likely help you a great deal. As it stands, with a 580, you''re actually closer to ...”
January 8, 2019
Rich.C@EMPOWERgmat.com posted a reply to The main ingredient in a certain prescription drug capsule c in the Problem Solving forum
“Hi All, We''re told that the main ingredient in a certain prescription drug capsule cost $500 per kilogram. If each capsule contains 600 milligrams of ingredient, what is the cost of the ingredient in a capsule? (1 kilogram = 10^6 milligrams). This is a ''unit conversion'' question and comes ...” January 7, 2019 Brent@GMATPrepNow posted a reply to In 1991, the price of a house was 80% of its original price. in the Problem Solving forum “I''d typically assign a "nice" value to the original price, and then follow the steps that Mitch demonstrated. Alternatively, we can solve the question algebraically In 1991, the price of a house was 80% of its original price. Let x = the original price So, 0.8x = the 1991 price ...” January 7, 2019 Brent@GMATPrepNow posted a reply to If triangle ABC is an isosceles triangle, what is ∠ABC? in the Data Sufficiency forum “Target question: What is ∠ABC? Given: Triangle ABC is an isosceles triangle So, ∆ABC has 2 equal angles Statement 1: ∠CAB = 45 degrees Since ∆ABC has 2 equal angles, there are two possible triangles that satisfy statement 1: Case a: ∠CAB = 45, ∠BCA = 45 and ∠ABC = 90. ...” January 7, 2019 Brent@GMATPrepNow posted a reply to If f(a*b) = f(a) + f(b), what is the value of f(1)? in the Problem Solving forum “To generalize Mitch''s and Fabio''s solutions, notice that, as long as we can get f(1) involved in the process, we''ll arrive at answer choice C every time. Notice that k = 1*k Since f(a*b) = f(a) + f(b), we can write: f(1*k) = f(1) + f(k) Simplify: f(k) = f(1) + f(k) Subtract f(k) from both ...” January 7, 2019 Max@Math Revolution posted a new topic called If f(a*b) = f(a) + f(b), what is the value of f(1)? in the Problem Solving forum “[Math Revolution GMAT math practice question] If f(a*b) = f(a) + f(b), what is the value of f(1)? A. 1 B. -1 C. 0 D. 2 E. -2” January 7, 2019 Max@Math Revolution posted a new topic called If x ≠ y, what is the value of ( x^2y – xy^2 ) / ( x^3 – y^3 in the Data Sufficiency forum “[Math Revolution GMAT math practice question] If x ≠ y, what is the value of ( x^2y – xy^2 ) / ( x^3 – y^3 )? 1) xy / ( x^2 + xy + y^2) = 1/3 2) x^2y^2=9” January 7, 2019 Max@Math Revolution posted a reply to In a sports club, 6 players are divided into 3 teams of 2 pl in the Problem Solving forum “=> Since we need to choose 2 players out of 6 players for the first team, choose 2 players out of 4 players for the second team and choose 2 players out of 2 players for the last team, the number of possible choices, in this order is 6C2*4C2*2C2. Since the order in which the three teams is ...” January 7, 2019 Max@Math Revolution posted a reply to If 4+ 1n = 55n, what is the value of n? in the Problem Solving forum “=> $$\sqrt{4+\frac{1}{n}}=5\sqrt{\frac{5}{n}}$$ $$\sqrt{\frac{4n+1}{n}}=5\sqrt{\frac{5}{n}}$$ $$\frac{4n+1}{n}=25\left(\frac{5}{n}\right)$$ $$\frac{4n+1}{n}=\frac{125}{n}$$ $$4n+1=125$$ $$4n=124$$ $$n=31$$ Therefore, the answer is A. Answer: A” January 7, 2019 Max@Math Revolution posted a reply to Is x/y < 0? in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The ...” January 7, 2019 Max@Math Revolution posted a reply to Is x/y < 0? in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” January 7, 2019 Rich.C@EMPOWERgmat.com posted a reply to After her birthday, Fiona had D dollars in gift money. in the Problem Solving forum “Hi VJesus12, We''re told that after her birthday, Fiona had D dollars in gift money. She spent 3/5 of this on an electric skateboard, then she spent 1/3 of what WAS LEFT on a movie passcard, and then finally put the last$80 in the bank. Assuming she made no other purchases with that money, ...”
January 6, 2019
Rich.C@EMPOWERgmat.com posted a reply to In the coordinate geometry plane, point A is the midpoint in the Problem Solving forum
“Hi VJesus12, This question can be solved with a bit of general graphing (you do not need to be hyper-accurate with your drawing to get the correct answer). To start, we''re told that in the coordinate geometry plane, Point A is the midpoint between points (5,8) and (-3, -2). Draw those two ...”
January 6, 2019
Rich.C@EMPOWERgmat.com posted a reply to In the figure above, an equilateral triangle is inscribed in the Problem Solving forum
“Hi VJesus12, We''re told that in the figure above, an EQUILATERAL triangle is inscribed in a circle and the arc bounded by adjacent corners of the triangle is between 4π and 6π long. We''re asked which of the following COULD be the diameter of the circle. As scary as this question might look, ...”
January 6, 2019
Brent@GMATPrepNow posted a reply to After her birthday, Fiona had D dollars in gift money. in the Problem Solving forum
“Another approach is to use algebra. After her birthday, Fiona had D dollars in gift money. She spent 3/5 of this on an electric skateboard. If Fiona SPENT 3/5 of D dollars, then 2/5 of D dollars REMAINED In other words, the amount remaining at the end of the day = 2D/5 dollars The next day, ...”
January 6, 2019
Brent@GMATPrepNow posted a reply to After her birthday, Fiona had D dollars in gift money. in the Problem Solving forum
“One option is to WORK BACKWARDS The next day, she spent 1/3 of what was left on a movie passcard, and then finally put the last $80 in the bank. If she spent 1/3 of her money on a movie passcard, then 2/3 of her money remained (which she put in the bank). This means 2/3 of her money =$80 We ...”
January 6, 2019
Brent@GMATPrepNow posted a reply to A retailer sells only radios and clocks. If she currently ha in the Data Sufficiency forum
“ Given: A retailer sells only radios and clocks, and she currently has 44 total items in inventory. Target question: How many radios are there in the inventory Statement 1: The retailer has more than 28 radios in inventory There are several scenarios that satisfy statement 1. Here are ...”
January 6, 2019
Brent@GMATPrepNow posted a reply to Number Properties in the Data Sufficiency forum
“The error is highlighted above in blue. if a>0 we will have the answer as YES is ALMOST true. The only time it''s not true is when a = 1 If a = 1, then the answer is NO. We can verify this using either the original inequality or the rephrased inequality. Take "Is a + 1/a > ...”
January 6, 2019
Brent@GMATPrepNow posted a reply to A store sells erasers for 0.23$per piece and pencil for in the Data Sufficiency forum “This question illustrates a common trap on the GMAT. As Jay has shown, with statement 2, we''re able to write the equation 23x + 11y = 170 , and in high school we learned that, if we''re given 1 equation with 2 variables, we cannot find the value of either variable. However, if we restrict the ...” January 5, 2019 Brent@GMATPrepNow posted a reply to A barn is enclosed in the shape of a 6-sided figure; all in the Data Sufficiency forum “This Date Sufficiency question is almost identical to the following Problem Solving question, which requires us to find the actual area: http://www.beatthegmat.com/plz-explain-t270003.html Cheers, Brent” January 5, 2019 Brent@GMATPrepNow posted a reply to In the rectangular coordinate system above, the area of 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 5, 2019 Brent@GMATPrepNow posted a reply to What is the perimeter of quadrilateral Q? in the Data Sufficiency forum “Target question: What is the perimeter of quadrilateral Q? If we recognize that each statement alone is not sufficient, we can jump straight to...... Statements 1 and 2 combined There are several quadrilaterals satisfy BOTH statements. Here are two: Case a: Q is a rectangle with width 1 ...” January 5, 2019 Brent@GMATPrepNow posted a reply to The price of a consumer good increased by p% in the Problem Solving forum “Let$100 be the original price The price of a consumer good increased by p% during 2012 p% = p/100, so a p% INCREASE is the same a multiplying the original price by 1 + p/100 So, the new price = ($100)(1 + p/100) The price then decreased by 12% during 2013 A 12% DECREASE is the same a ...” January 5, 2019 Brent@GMATPrepNow posted a reply to The number of students who attend a school could be divided in the Problem Solving forum “The number of students who attend a school could be divided among 10, 12, or 16 buses, such that each bus transports an equal number of students. This tells us that the TOTAL number of students is a multiple of 10, 12 and 16 What is the minimum number of students that could attend the school? ...” January 5, 2019 Brent@GMATPrepNow posted a reply to Set K consists of a finite number of consecutive odd in the Data Sufficiency forum “Target question: What is the value of y - x? Given: Set K consists of a finite number of consecutive odd integers Statement 1: The average (arithmetic mean) of set K is –36 There''s a nice rule that says, "In a set where the numbers are equally spaced, the mean will equal the ...” January 5, 2019 Brent@GMATPrepNow posted a reply to The value of (10^8-10^2)/(10^7-10^3) is closest to which in the Problem Solving forum “Since the answer choices are so spread out, we can be quite aggressive with out estimation. First, 10⁸ - 10² can be rounded to 10⁸ Is this reasonable? Well, 10⁸ equals 100,000,000, so subtracting 10² (aka 100) from 100,000,000 still leaves us with approximately 100,000,000 ...” January 5, 2019 Brent@GMATPrepNow posted a reply to Each of the 25 balls in a certain box is either red, blue, in the Data Sufficiency forum “Target question: What is the value of P(white or even)? To solve this, we need P(A or B) = P(A) + P(B) - P(A & B) So, P(white or even) = P(white) + P(even) - P(white & even) Statement 1: P(white & even) = 0 We can add this to our probability equation to get: P(white or even) = ...” January 4, 2019 Brent@GMATPrepNow posted a reply to The profit from the sale of a certain appliance increases, in the Data Sufficiency forum “Target question: Did the profit exceed$4 million on sales of 380,000 units? Given: The profit from the sale of a certain appliance increases, though not proportionally, with the number of units sold. IMPORTANT: This means that we CANNOT make any "good" assumptions about the ...”
January 4, 2019
Rich.C@EMPOWERgmat.com posted a reply to Alice, Benjamin, and Carol each try independently to win a c in the Problem Solving forum
“Hi jain2016, Since we have the probabilities of each person winning a game, we can ''map out'' the 3 situations in which 2 of them win and 1 of them loses: A wins, B wins, C loses = (1/5)(3/8)(5/7) = 15/240 A wins, B loses, C wins = (1/5)(5/8)(2/7) = 10/240 A loses, B wins, C wins = ...”
January 4, 2019
Rich.C@EMPOWERgmat.com posted a reply to If y = 2 + 2K and y≠0y≠0, then 1/y + 1/y + 1/y + 1/y = ? in the Problem Solving forum
“Hi All, We''re told that Y = 2 + 2K and Y ≠ 0. We''re asked for the value of 1/Y + 1/Y + 1/Y + 1/Y. This question can be solved in a number of different ways, including by TESTing VALUES. Since we''re adding four fractions with the SAME denominator, we can just use some basic Arithmetic and ...”
January 4, 2019
Brent@GMATPrepNow posted a reply to If y = 2 + 2K and y≠0y≠0, then 1/y + 1/y + 1/y + 1/y = ? in the Problem Solving forum
“Given: y = 2 + 2k Rewrite as: y/1 = (2 + 2k)/1 Flip both fractions to get: 1/y = 1/(2 + 2k) So, 1/y + 1/y + 1/y + 1/y = 1/(2 + 2k) + 1/(2 + 2k) + 1/(2 + 2k) + 1/(2 + 2k) = 4/(2 + 2k) = 4/(2)(1 + k) = 2/(1 + k) Answer: B Cheers, Brent”
January 4, 2019
Brent@GMATPrepNow posted a reply to Is x/y < 0? in the Data Sufficiency forum
“Target question: Is x/y < 0? Statement 1: (x^4)(y^5) < 0 There are several values of x and y that satisfy statement 1. Here are two: Case a: x = 1 and y = -1. Notice that (x^4)(y^5) = (1^4)(-1^5) = (1)(-1) = -1, which is less than 0. In this case, x/y = 1/(-1) = -1. So, the answer to ...”
January 4, 2019
Max@Math Revolution posted a new topic called In a sports club, 6 players are divided into 3 teams of 2 pl in the Problem Solving forum
“[Math Revolution GMAT math practice question] In a sports club, 6 players are divided into 3 teams of 2 players. How many such arrangements are possible? A. 10 B. 15 C. 25 D. 30 E. 40”
January 4, 2019
Max@Math Revolution posted a reply to Which of the following could be the area of a regular hexago in the Problem Solving forum
“https://i.postimg.cc/DSx8z814/1-4.png => Let n be the side-length of a regular hexagon. Then the area of the shaded equilateral triangle is (√3/4)n^2 and the area of the regular hexagon is (6√3/4)n^2 = (3√3/2)n^2 . If n = 2, then (3√3/2)n^2 = (3√3/2)2^2 =6√3. None of the ...”
January 4, 2019
Max@Math Revolution posted a new topic called Is x/y < 0? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] Is x/y < 0? 1) x^4y^5 < 0 2) x^5y^3 < 0”
January 4, 2019
Max@Math Revolution posted a reply to Can n be expressed as the difference of 2 prime numbers? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...”
January 4, 2019
Brent@GMATPrepNow posted a reply to If 4+ 1n = 55n, what is the value of n? in the Problem Solving forum
“GIVEN: √(4 + 1/n) = 5√(5/n) Square both sides to get: (5)(5)√(5/n)√(5/n) Simplify right side again: 4 + 1/n = 25(5/n) Simplify right side: 4 + 1/n = 125/n Multiply both sides by n to get: 4n + 1 = 125 Subtract 1 from both sides to get: 4n = 124 Solve: n = 124/4 =31 Answer: A ...”
January 3, 2019
Brent@GMATPrepNow posted a reply to On a construction site, 16 of the men wear helmets, and 19 in the Data Sufficiency forum
“I thought I''d point out that Jay''s approach is also 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 construction worker, and the two ...”
January 3, 2019
Brent@GMATPrepNow posted a reply to If the average of four numbers is 35, how many of the in the Data Sufficiency forum
“Target question: How many of the numbers are less than 35? Given: The average of four numbers is 35 All this tells us is that the SUM of the 4 numbers is 140 (since 140/4 = 35) Given the limited amount of information, it''s likely that the correct answer is C or E Statement 1: None of ...”
January 3, 2019
Max@Math Revolution posted a new topic called If 4+ 1n = 55n, what is the value of n? in the Problem Solving forum
“[Math Revolution GMAT math practice question] If $$\sqrt{4+\frac{1}{n}}=5\sqrt{\frac{5}{n}}$$ , what is the value of n? A. 31 B. 41 C. 51 D. 61 E. 71”
January 3, 2019
Max@Math Revolution posted a reply to If 2x+y=3 and 4x^2-4xy+y^2=1, what is the value of xy? in the Problem Solving forum
“=> Since 2x+y=3, (2x+y)^2 = 4x^2+4xy+y^2 =9. When we subtract 4x^2-4xy+y^2=1 from 4x^2+4xy+y^2 =9, we obtain (4x^2+4xy+y^2) - (4x^2-4xy+y^2) = 8xy = 9 - 1 = 8. So, xy = 1. Therefore, the answer is C. Answer: C”
January 3, 2019
Max@Math Revolution posted a new topic called Is x/y < 0? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] Is x/y < 0? 1) |x+y| < |x|+|y| 2) x+y < 0”
January 3, 2019
Max@Math Revolution posted a reply to What is the value of the integer n? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 3, 2019
Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum
“To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...”
January 3, 2019
Brent@GMATPrepNow posted a reply to Absolute value in the Problem Solving forum
“A quick approach is to simply test the answer choices A) -2 No good. The absolute value of something cannot be negative B) 0 Plug in to get |0² - 6| = 0. Doesn''t work. C) 1 Plug in to get |1² - 6| = 1. Doesn''t work. D) 3 Plug in to get |3² - 6| = 3. WORKS!!! Answer: D Cheers, ...”
January 3, 2019
Brent@GMATPrepNow posted a reply to If m and n are positive integers such that m>n, what is t in the Data Sufficiency forum
“ Given: m and n are positive integers such that m > n Target question: What is the remainder when m² – n² is divided by 21? Statement 1: The remainder when (m + n) is divided by 21 is 1 There are several values of m and n that satisfy statement 1. Here are two: Case a: m = 12 and ...”
January 2, 2019
Brent@GMATPrepNow posted a reply to If x + y is not equal to 0. What is the value of (ax + ay)/( in the Data Sufficiency forum
“Target question: What is the value of (ax + ay)/(x + y)? This is a good candidate for rephrasing the target question. Take the expression: (ax + ay)/(x + y) Factor the numerator to get: a(x + y)/(x + y) Simplify the fraction to get: a Since (ax + ay)/(x + y) = a, we can rephrase the target ...”
January 2, 2019
Brent@GMATPrepNow posted a reply to Can n be expressed as the difference of 2 prime numbers? in the Data Sufficiency forum
“Target question: Can n be expressed as the difference of 2 prime numbers? Statement 1: (n-17)(n-21) = 0 This tells us that EITHER n = 17 OR n = 21 IMPORTANT: Upon seeing that n can equal one of two values, some students will incorrectly conclude that statement 1 is not sufficient. However, ...”
January 2, 2019
Max@Math Revolution posted a new topic called Which of the following could be the area of a regular hexago in the Problem Solving forum
“[Math Revolution GMAT math practice question] Which of the following could be the area of a regular hexagon in which the length of the equal sides is an integer? A. √3/6 B. √3/5 C. √3/4 D. 6√3 E. 3√3/4”
January 2, 2019
Max@Math Revolution posted a reply to (x^8y^2+x^2y^8)/(x^2+y^2)=? in the Problem Solving forum
“=> (x^8y^2+x^2y^8)/(x^2+y^2)= x^2y^2(x^6+y^6)/(x^2+y^2)= x^2y^2(x^2+y^2)(x^4-x^2y^2+y^4)/(x^2+y^2)= x^2y^2 (x^4-x^2y^2+y^4), using the identity a^3+b^3 = (a+b)(a^2-ab+b^2). Therefore, the answer is A. Answer: A”
January 2, 2019
Max@Math Revolution posted a new topic called Can n be expressed as the difference of 2 prime numbers? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] Can n be expressed as the difference of 2 prime numbers? 1) (n-17)(n-21) = 0 2) (n-15)(n-17)=0”
January 2, 2019
Max@Math Revolution posted a reply to Is √(x+1)^2=x+1 ? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
January 2, 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 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to In a stack of boards at a lumber yard, the 20th board counti in the Problem Solving forum
“Hi All, Since the answers to the question are all numbers, we can use the answers ''against'' the prompt and TEST THE ANSWERS. Here''s how… Let''s start with Answer B. Answer B: 36 boards IF the number of boards was 36, then the 20th board from the top would be the 17th board from ...”
January 1, 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 1, 2019
Rich.C@EMPOWERgmat.com posted a reply to A department store receives a shipment of 1,000 shirts, for in the Problem Solving forum
“Hi All, We''re told that a department store receives a shipment of 1,000 shirts, for which it pays $9,000. The store sells the shirts at a price 80 percent above cost for one month, after which it reduces the price of the shirts to 20 percent above cost. The store sells 75 percent of the shirts ...” January 1, 2019 Brent@GMATPrepNow posted a reply to What is the value of the integer n? in the Data Sufficiency forum “Target question: What is the value of the integer n? Statement 1: n is a prime factor of 21 21 = (3)(7) So, EITHER n = 3 OR n = 7 Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT Statement 2: n is a factor of 49 49 has three positive factors: 1, ...” January 1, 2019 Brent@GMATPrepNow posted a reply to If 2x+y=3 and 4x^2-4xy+y^2=1, what is the value of xy? in the Problem Solving forum “This question becomes a lot easier if we recognize that (2x + y)² = 4x² + 4xy + y² (which is VERY similar to 4x² - 4xy + y²) Here''s what I mean: Take 2x + y = 3 and square both sides to get: (2x + y)² = 3² Simplify both sides to get: 4x² + 4xy + y²= 9 We now have two (quite ...” January 1, 2019 Max@Math Revolution posted a new topic called If 2x+y=3 and 4x^2-4xy+y^2=1, what is the value of xy? in the Problem Solving forum “[Math Revolution GMAT math practice question] If 2x+y=3 and 4x^2-4xy+y^2=1, what is the value of xy? A. 1/8 B. 1/2 C. 1 D. 2 E. 4” January 1, 2019 Max@Math Revolution posted a new topic called What is the value of the integer n? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] What is the value of the integer n? 1) n is a prime factor of 21 2) n is a factor of 49” January 1, 2019 Brent@GMATPrepNow posted a reply to Given four rods of length 1 meter, 3 meters, 5 meters, and 7 in the Problem Solving forum “IMPORTANT RULE: If two sides of a triangle have lengths A and B, then . . . DIFFERENCE between A and B < length of third side < SUM of A and B Let''s focus on this part: length of third side < SUM of A and B We can also say that the length of LONGEST side must be less than the SUM of ...” December 31, 2018 Brent@GMATPrepNow posted a reply to Brady, Charlie, and Daryl play on the same baseball team. Th in the Data Sufficiency forum “ Given: Brady, Charlie, and Daryl play on the same baseball team. Target question: The number of home runs hit by Brady in a particular season is what fraction of the total home runs hit by the three players in that season? This is a good candidate for rephrasing the target question. Let ...” December 31, 2018 Brent@GMATPrepNow posted a reply to What is the 1st term in sequence S ? (1) The 3rd term in S in the Data Sufficiency forum “Target question: What is the 1st term in sequence S ? Statement 1: The 3rd term in S is 2 Since we''re not given any information about the NATURE of the sequence, there''s no way to answer the target question with certainty. So, statement 1 is NOT SUFFICIENT Statement 2: The 2nd term in ...” December 31, 2018 Brent@GMATPrepNow posted a reply to Bite-sized video lessons from GMAT Prep Now in the GMAT Math forum “Here''s our video on Weighted Averages video: https://www.youtube.com/watch?v=B7J6lr_qBG4 Cheers, Brent” December 31, 2018 Max@Math Revolution posted a new topic called (x^8y^2+x^2y^8)/(x^2+y^2)=? in the Problem Solving forum “[Math Revolution GMAT math practice question] (x^8y^2+x^2y^8)/(x^2+y^2)=? A. x^2y^2(x^4-x^2y^2+y^4) B. x^2y(x^4+x^2y^2+y^4) C. x^2y^2(x^2+y^2) D. x^2y^2(x+y) E. x^4y^4(x^2-y^2)” December 31, 2018 Max@Math Revolution posted a new topic called Is √(x+1)^2=x+1 ? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] Is $$\sqrt{\left(x+1\right)^2}=x+1$$ ? 1) x(x-2) = 0 2) x(x+2) = 0” December 31, 2018 Max@Math Revolution posted a reply to If f(x)=1-(1/x), then f(f(f(x)))=? in the Problem Solving forum “=> f(x) = 1 – 1/x = (x-1)/x f(f(x)) = 1 – 1/f(x) = 1 – x/(x-1) = (x-1-x)/(x-1) = - 1/(x-1) f(f(f(x))) = 1 – 1/f(f(x)) = 1 – ( - (x-1)) = 1 + x – 1 = x Therefore, the answer is A. Answer: A” December 31, 2018 Max@Math Revolution posted a reply to If x^2+y^2=2xy, then (x+y)/(2x-y)=? in the Problem Solving forum “=> x^2+y^2=2xy => x^2+y^2-2xy=0 => (x-y)^2 = 0 => x = y (x+y)/(2x-y)= (x+x) / (2x-y) = 2x/x = 2, since x =y. Therefore, the answer is E. Answer: E ” December 31, 2018 Max@Math Revolution posted a reply to In the xy-coordinate plane, does y=a(x-h)^2+k intersect the in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...” December 31, 2018 Max@Math Revolution posted a reply to If m and n are positive integers, is 3^{4m+2}+n divisible b in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” December 31, 2018 Brent@GMATPrepNow posted a reply to Marcia's bucket can hold a maximum of how many liters of wat in the Data Sufficiency forum “Target question: Marcia''s bucket can hold a maximum of how many liters of water? In other words, what is the TOTAL CAPACITY of Marcia''s bucket? Statement 1: The bucket currently contains 9 liters of water. Not enough info to determine the TOTAL CAPACITY of Marcia''s bucket. Since we ...” December 30, 2018 Brent@GMATPrepNow posted a reply to In a stack of boards at a lumber yard, the 20th board counti in the Problem Solving forum “Let''s start from the bottom and work our way up: We''ll start with the 16th board counting from the bottom of the stack Right BELOW that 16th board, we have a board that we''ll call Larry. So, Larry is the 15th board counting from the bottom of the stack. So, starting from the bottom and ...” December 30, 2018 Brent@GMATPrepNow posted a reply to Overlapping Sets in the Data Sufficiency forum “I thought I''d point out that Manasa3190''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 people, and the two characteristics are: ...” December 30, 2018 Rich.C@EMPOWERgmat.com posted a reply to If it takes Jacob x hours to complete a project and it in the Problem Solving forum “Hi All, We''re told that it takes Jacob X hours to complete a project and it takes Mike Y hours to complete the same project. We''re asked for the number of hours it would take them to complete the project if they worked together. This is a great ''concept'' question; if you recognize the ...” December 29, 2018 Rich.C@EMPOWERgmat.com posted a reply to The employees of Smith Enterprises received wage increases in the Problem Solving forum “Hi All, We''re told that the employees of Smith Enterprises received wage increases ranging from 30 cents to 87.5 cents per hour. We''re asked for the MAXIMUM wage increase for a 40-hour week. This question comes down to some basic arithmetic (but you might find it faster to do your math in a ...” December 29, 2018 Rich.C@EMPOWERgmat.com posted a reply to Of the paintings that a certain artist created last year, th in the Problem Solving forum “Hi All, We''re told that of the paintings that a certain artist created last year, the number of paintings that were UNFRAMED was 5 times the number of paintings that were FRAMED and 48 percent of the UNFRAMED paintings and 30 percent of the FRAMED paintings were SOLD. We''re asked for the ...” December 29, 2018 Rich.C@EMPOWERgmat.com posted a reply to Before expansion, a zoo had 343 birds in 7 cages. If, after in the Problem Solving forum “Hi All, We''re told that BEFORE expansion, a zoo had 343 birds in 7 cages and AFTER the expansion was complete, there were 719 birds in 11 cages. We''re asked for the approximate percent increase in the average number of birds per cage. This question is based around a couple of standard math ...” December 29, 2018 Rich.C@EMPOWERgmat.com posted a reply to Scott takes a trip and drives 6 hours from Town X to Town Z in the Problem Solving forum “Hi All, We''re told that Scott takes a trip and drives 6 hours from Town X to Town Z at a rate of 50 miles per hour. On his way back, Scott drives 75 miles per hour and stops in Town Y which is MIDWAY between Town X and Town Z. We''re asked for the number of HOURS Scott takes to drive from Town ...” December 29, 2018 Rich.C@EMPOWERgmat.com posted a reply to A merchant paid$300 for a shipment of x identical in the Problem Solving forum
“Hi All, The information in the prompt include a variety of nice ''round'' numbers, so it''s likely that the number of calculators in the shipment is also a round number AND divides evenly into 300. Only two of the answers ''fit'' that idea - 25 and 30, so let''s TEST THE ANSWERS and see if ...”
December 29, 2018
Brent@GMATPrepNow posted a reply to Car X left Town T (RATE PROBLEM, Need Help) in the Problem Solving forum
“IMPORTANT: Let''s use HOURS throughout our solution, and then convert hours to minutes at the end. When car Y had traveled for z HOURS, car Y had traveled 23 miles more that car X had from the time that car X left Town T. z = car Y''s travel time in HOURS So, z + 3/10 = car X''s travel time in ...”
December 28, 2018
Max@Math Revolution posted a new topic called If f(x)=1-(1/x), then f(f(f(x)))=? in the Problem Solving forum
“[Math Revolution GMAT math practice question] If f(x)=1-(1/x), then f(f(f(x)))=? A. x B. 1/x C. 1/x+1 D. -1/x+1 E. x/x+1”
December 28, 2018
Max@Math Revolution posted a reply to If a certain coin is flipped, it has probability 1/2 of land in the Problem Solving forum
“=> The complementary case is the event with all heads, which has probability (1/2)^4. The probability of at least one tail is 1 – (1/2)^4 = 1 – 1/16 = 15/16. Therefore, the answer is E. Answer: E”
December 28, 2018
Max@Math Revolution posted a new topic called In the xy-coordinate plane, does y=a(x-h)^2+k intersect the in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] In the xy-coordinate plane, does y=a(x-h)^2+k intersect the x-axis? 1) h=1 2) k=2”
December 28, 2018
Max@Math Revolution posted a reply to If m and n are positive integers, is m + n an odd number? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...”
December 28, 2018
Rich.C@EMPOWERgmat.com posted a reply to Fred has a jarful of nickels, dimes, and quarters, in the ra in the Problem Solving forum
“Hi All, We''re told that Fred has a jarful of nickels, dimes, and quarters, in the ratio of 2:5:10, respectively and the total value of these coins is $15.50. We''re asked for the number of DIMES in Fred’s jar. This question is based on ratio rules - and ratios are all about multiples - so you ...” December 27, 2018 Rich.C@EMPOWERgmat.com posted a reply to A certain bank uses the formula above to approximate the in the Problem Solving forum “Hi All, We''re asked for the mathematical equivalent of the following formula: $$R=\frac{\frac{24F}{N}}{P+\frac{A}{12}}$$ While the prompt (and the answers) might look ''complex'', the work involved is based on a simple math premise (common denominators), so as long as you are thorough ...” December 27, 2018 Rich.C@EMPOWERgmat.com posted a reply to What is the largest value of non-negative integer N for in the Problem Solving forum “Hi All, We''re asked for the largest value of N for which 10^N is a factor of 50! This question comes down to ''prime factorization'' and requires a degree of thoroughness on your part (to make sure that you find all of the 10s in 50!) To start, 50! = (50)(49)(48)(47)(46)(45).....(3)(2)(1), ...” December 27, 2018 Rich.C@EMPOWERgmat.com posted a reply to A retailer sells pashminas at a ten percent discount. If a in the Problem Solving forum “Hi All, We''re told that a retailer sells pashminas at a ten percent discount, a pashmina COST him$75 and he wants to make a profit of no less than twenty percent on the COST (after the discount). We''re asked for the minimum tag price he needs to put on a pashmina. To start, this question ...”
December 27, 2018
Rich.C@EMPOWERgmat.com posted a reply to HELP!!! Very POOR VERBAL score. in the Suggestions and Feedback forum
“Hi Linda, Many Test Takers spend 3 months (or more) of consistent study time before they hit their ''peak'' scores, so you shouldn''t feel too down about this performance if you studied for just 6 weeks (and primarily just on the weekends). Thankfully, the GMAT is a consistent, predictable Exam, ...”
December 27, 2018
Max@Math Revolution posted a new topic called If x^2+y^2=2xy, then (x+y)/(2x-y)=? in the Problem Solving forum
“[Math Revolution GMAT math practice question] If x^2+y^2=2xy, then (x+y)/(2x-y)=? A. -2 B. -1 C. 0 D. 1 E. 2”
December 27, 2018
Max@Math Revolution posted a reply to If x^2+y^2=28 and xy=11, what is the value of (x+y)^2? in the Problem Solving forum
“=> (x+y)^2 = x^2 + 2xy + y^2 = x^2 + y^2 + 2xy = 28 + 2*11 = 28 + 22 = 50. Therefore, the answer is C. Answer: C”
December 27, 2018
Max@Math Revolution posted a new topic called If m and n are positive integers, is 3^{4m+2}+n divisible b in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If m and n are positive integers, is 3^{4m+2}+n divisible by 5? 1) m=3 2) n=1”
December 27, 2018
Max@Math Revolution posted a reply to If n is a positive integer, is in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 27, 2018
Rich.C@EMPOWERgmat.com posted a reply to A set of 15 different integers has median of 25 and a range in the Problem Solving forum
“Hi All, When it comes to maximizing or minimizing a value in a group of numbers, you have to think about what the other numbers would need to be to accomplish your goal. Here, we have a group of 15 DISTINCT (meaning DIFFERENT) integers with a median of 25 and a RANGE of 25. That range will ...”
December 26, 2018
Rich.C@EMPOWERgmat.com posted a reply to A certain punch contains grape juice, orange juice, and in the Problem Solving forum
“Hi All, We''re told that a certain punch contains grape juice, orange juice, and pineapple juice and no other ingredients in a ratio of 2:3:7 respectively and a bowl contains 156 total ounces of this punch. We''re asked for the number of ounces of grape juice in the punch. This question can be ...”
December 26, 2018
Max@Math Revolution posted a new topic called If a certain coin is flipped, it has probability 1/2 of land in the Problem Solving forum
“[Math Revolution GMAT math practice question] If a certain coin is flipped, it has probability 1/2 of landing on heads and probability 1/2 of landing on tails. If the coin is flipped 4 times, what is the probability that it will land on tails at least once? A. 3/8 B. 1/4 ...”
December 26, 2018
Max@Math Revolution posted a reply to If 0 < x < 2 and 0 < y < 2 on the xy-plane, what in the Problem Solving forum
“=> https://i.postimg.cc/KRTTYwRc/12-26.png The outside square contains all points satisfying 0 < x < 2 and 0 < y < 2. The shaded region consists of all points satisfying 0 < x < 2 and 0 < y < 2 such that x + y < 1. Its area is 1/2, and the area of the outside ...”
December 26, 2018
Max@Math Revolution posted a new topic called If m and n are positive integers, is m + n an odd number? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If m and n are positive integers, is m + n an odd number? 1) m/n is an even number 2) m or n is an even number”
December 26, 2018
Max@Math Revolution posted a reply to f(x) is the greatest prime factor of x. If n is a positive i in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...”
December 26, 2018
Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum
“To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...”
December 26, 2018
Max@Math Revolution posted a new topic called If x^2+y^2=28 and xy=11, what is the value of (x+y)^2? in the Problem Solving forum
“[Math Revolution GMAT math practice question] If x^2+y^2=28 and xy=11, what is the value of (x+y)^2? A. 28 B. 39 C. 50 D. 61 E. 72”
December 25, 2018
Max@Math Revolution posted a new topic called If n is a positive integer, is in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If n is a positive integer, is $$\sqrt{n+1}$$ an even integer? 1) n is the product of 2 consecutive odd numbers 2) n is an odd number”
December 25, 2018
Max@Math Revolution posted a reply to (0.0004)(0.000005)/200,000 is equal to which of the followin in the Problem Solving forum
“You are right. The solution and choices are fixed. Thank you for your comments.”
December 24, 2018
Rich.C@EMPOWERgmat.com posted a reply to The sum of the weekly salaries of 5 employees is $3,250. If in the Problem Solving forum “Hi All, We''re told that the SUM of the weekly salaries of 5 employees is$3,250 and that each of the 5 salaries is to increase by 10 percent. We''re asked for the AVERAGE increase in weekly salary per employee. This question ultimately comes down to working through some arithmetic, but ...”
December 24, 2018
Rich.C@EMPOWERgmat.com posted a reply to 90 Day Flexible Plan for a decent verbal/low quant old score in the GMAT Strategy forum
“Hi LDCross, For free math practice and help, I recommend that you set up an account at Khan Academy (www.khanacademy.org). The site is completely free and makes the learning a bit more fun and ''game-like'' (as opposed to the dry academic approach taken by most books). While the site is vast, ...”
December 24, 2018
Max@Math Revolution posted a new topic called If 0 < x < 2 and 0 < y < 2 on the xy-plane, what is the prob in the Problem Solving forum
“[Math Revolution GMAT math practice question] If 0 < x < 2 and 0 < y < 2 on the xy-plane, what is the probability that x+y < 1? A. 1/2 B. 1/4 C. 1/6 D. 1/8 E. 1/10”
December 24, 2018
Max@Math Revolution posted a new topic called f(x) is the greatest prime factor of x. If n is a positive i in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] f(x) is the greatest prime factor of x. If n is a positive integer less than 10, what is the value of n? 1) f(n) = f(1000) 2) f(n) = 5”
December 24, 2018
Max@Math Revolution posted a reply to 120 tickets are to be evenly distributed to n people. If n in the Problem Solving forum
“Hello, Fabio We edited thw solutions. Thanks.”
December 24, 2018
Max@Math Revolution posted a reply to What is the smallest integer n such that 2^8 is a factor of in the Problem Solving forum
“=> Since 2 = 2^1, 4 = 2^2, 6 = 2^1*3, 8 = 2^3, 10=2^1*5, the prime factorization of 10! = 1*2*3*…*10 has the form 28*m for some integer m, where m and 2 are relatively prime. Note that 9! = 2^7*k for some integer k, where k and 2 are relatively prime. Therefore, the answer is B. Answer: ...”
December 24, 2018
Max@Math Revolution posted a reply to 120 tickets are to be evenly distributed to n people. If n in the Problem Solving forum
“=> 120 = 2^3*3^1*5^1 or 120 = 8*15. Thus 15 is the greatest factor among choices. Therefore, the answer is E. Answer: E”
December 24, 2018
Max@Math Revolution posted a reply to n is a positive integer. Is n(n+1)(n+2)/4 an even integer? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 24, 2018
Max@Math Revolution posted a reply to Is |m-n|=|m|-|n| ? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 24, 2018
Brent@GMATPrepNow posted a reply to A shipping company has four empty trucks that will head out in the Problem Solving forum
“Take the task of shipping the 4 boxes and break it into stages. Let''s call the 4 boxes A, B, C and D Stage 1: Select a truck to ship box A in There are 4 trucks from which to choose, so we can complete stage 1 in 4 ways Stage 2: Select a truck to ship box B in There are 4 trucks ...”
December 24, 2018
Brent@GMATPrepNow posted a reply to resolution in the Data Sufficiency forum
“ Given: A quorum of at least half the 20 directors must pass the resolution by at least a two-thirds majority Target question: At a meeting of the board of directors, did resolution X pass or fail?  Statement 1: Ten directors voted for the resolution.  KEY: We don''t know how many ...”
December 23, 2018
Rich.C@EMPOWERgmat.com posted a reply to A plane traveled k miles in its first 96 minutes of flight in the Problem Solving forum
“Hi All, We''re told that a plane traveled K miles in its first 96 minutes of flight time and it completed the remaining 300 miles of the trip in T minutes. We''re asked for the average speed of the plane, in miles per hour, for the entire trip. This question can be solved by TESTing VALUES. ...”
December 23, 2018
Brent@GMATPrepNow posted a reply to a data from gmat forum in the Data Sufficiency forum
“ Given: Every student at the Performing Arts Academy must take at least one of the two drama courses offered, Classical Theater or Improvisation. 15% of the students who take Classical Theater also take Improvisation Let''s use the Every student at the Performing Arts Academy must take at least ...”
December 23, 2018
Brent@GMATPrepNow posted a reply to Tough Rate problem in the Data Sufficiency forum
“ Given: At a certain department store present-wrapping counter, each clerk will wrap no fewer than twenty and no more than thirty presents per hour. Target question: If seventy people are standing in line, will all of their presents be wrapped after one hour? Statement 1: Each person in ...”
December 23, 2018
Rich.C@EMPOWERgmat.com posted a reply to A scientist has 400 units of a 6% phosphoric acid solution, in the Problem Solving forum
“Hi All, While an Algebra approach (using the "weighted average" formula) would work nicely on this prompt, you can also answer it rather quickly by TESTing THE ANSWERS and using a bit of logic. Here, we''re going to mix 400 ounces of a 6% acid solution with X ounces of a 12% acid ...”
December 22, 2018
Brent@GMATPrepNow posted a reply to Two trees have a combined height of 60 feet, and the taller in the Problem Solving forum
“Let y = the height of the shorter tree The taller tree is x times the height of the shorter tree. Ho So, yx = the height of the taller tree The two trees have a combined height of 60 feet We can write: y + yx = 60 How tall is the shorter tree, in terms of x? We must solve the equation ...”
December 22, 2018
Rich.C@EMPOWERgmat.com posted a reply to Two water pumps, working simultaneously at their respective in the Problem Solving forum
“Hi All, This is an example of a Work Formula question. Any time you have two entities (people, machines, water pumps, etc.) working on a job together, you can use the following formula: (AB)/(A+B) = Total time to do the job together Here, we''re told that the total time = 4 hours and ...”
December 22, 2018
Rich.C@EMPOWERgmat.com posted a reply to Two trees have a combined height of 60 feet, and the taller in the Problem Solving forum
“Hi All, We''re told that two trees have a combined height of 60 feet and the taller tree is X times the height of the shorter tree. We''re asked to find the height of the shorter tree in terms of X. This question can be approached in a couple of different ways, including by TESTing VALUES. IF ...”
December 22, 2018
Brent@GMATPrepNow posted a reply to Two water pumps, working simultaneously at their respective in the Problem Solving forum
“Let''s pick some nice numbers that adhere to the given information. ...the constant rate of one pump was 1.5 times the constant rate of the other So, the fast pump has a pumping rate that''s 1.5 faster then the slow pump. So, let''s say the SLOW pump pumps at 2 gallons per hour This means ...”
December 22, 2018
Brent@GMATPrepNow posted a reply to Fractions/Ratios in the Data Sufficiency forum
“ Given: There are two types of rolls on a counter, plain rolls and seeded rolls. Let P = # of plain rolls Let S = # of seeded rolls Target question: What is the value of P + S? Statement 1: The ratio of the number of seeded rolls on the counter to the number of plain rolls on the ...”
December 21, 2018
Brent@GMATPrepNow posted a reply to Five friends - Ross, Phoebe, Chandler, Joey and Monica - in the Problem Solving forum
“Take the task of feeding the 5 friends and break it into stages. We’ll begin with the most restrictive stage(s). Stage 1: Select a pizza for Phoebe Since Phoebe will only eat Margherita pizza, there''s only 1 pizza we can serve her. So, we can complete stage 1 in 1 way Stage 2: ...”
December 21, 2018
Max@Math Revolution posted a new topic called What is the smallest integer n such that 2^8 is a factor of in the Problem Solving forum
“[Math Revolution GMAT math practice question] What is the smallest integer n such that 2^8 is a factor of n!? A. 8 B. 10 C. 12 D. 14 E. 16”
December 21, 2018
Max@Math Revolution posted a reply to How many 4-digit numbers greater than 3,000 have the digits: in the Problem Solving forum
“=> We need to count the 4-digit numbers with thousands digits 3, 5 and 7. The number of 4-digit numbers beginning with 3 is 6. The number of 4-digit numbers beginning with 5 is 6. The number of 4-digit numbers beginning with 7 is 6. Thus, the total number of such 4-digit numbers is 18 = 6 ...”
December 21, 2018
Max@Math Revolution posted a new topic called n is a positive integer. Is n(n+1)(n+2)/4 an even integer? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] n is a positive integer. Is n(n+1)(n+2)/4 an even integer? 1) n is an even integer 2) 1238 ≤ n ≤ 1240”
December 21, 2018
Max@Math Revolution posted a reply to Is x/y>1? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 21, 2018
Brent@GMATPrepNow posted a reply to A list kept at Town Hall contains that town's average daily in the Data Sufficiency forum
“Target question: Does this month have 30 or 31 days? IMPORTANT: Notice that the question does not ask "How many days are in this month?" If that were the case, then we''d have to consider February. Instead, the question is ruling out February by basically telling us that the month in ...”
December 20, 2018
Brent@GMATPrepNow posted a reply to In how many ways can the letters D, I, G, I, T be arranged in the Problem Solving forum
“One approach is to count all possible arrangements (that may or may not break the given rule) and then subtract all outcomes the break the rule. Here''s another approach. Take the task of arranging the 5 letters and break it into stages. Stage 1: Arrange the 3 CONSONANTS (D, G and T) in a ...”
December 20, 2018
Brent@GMATPrepNow posted a reply to Inequalities in the GMAT Math forum
“Target question: Is x² > y²? Statement 2: x > y There are several values of x and y that satisfy statement 2. Here are two: Case a: x = 2 and y = 1. In this case, x² = 4 and y² = 1. So, the answer to the target question is YES, x² IS greater than y² Case b: x = -2 and y = -3. ...”
December 20, 2018
Rich.C@EMPOWERgmat.com posted a reply to A certain company charges $6 per package to ship packages in the Problem Solving forum “Hi All, We''re told that a certain company charges$6 per package to ship packages weighing less than 2 pounds each. However, for a package weighing 2 pounds or more, the company charges an initial fee of $6 plus$2 per pound. We''re told that a certain package cost $38 to ship. We''re asked for ...” December 20, 2018 Rich.C@EMPOWERgmat.com posted a reply to One woman and one man can build a wall together in two hours in the Problem Solving forum “Hi All, Each of the other explanations explains the ''math'' behind this prompt, so I won''t rehash any of that here. Instead, I want to talk about the ''patterns'' behind this question, and how you can answer it without doing much math at all. To start, we have to sort through a lot of ...” December 20, 2018 Rich.C@EMPOWERgmat.com posted a reply to Before being simplified, the instructions for computing in the Problem Solving forum “Hi All, This question can be solved by TESTing VALUES. I''m going to use the variable "J" instead of an "I" (since that might be mistaken for the number 1)... We''re told to add "2% of one''s income" to "the average of 100 and 1% of one''s income" ...” December 20, 2018 Rich.C@EMPOWERgmat.com posted a reply to At the Trenchard Oaks apartment complex, a two-bedroom apart in the Problem Solving forum “Hi All, We''re told that a two-bedroom apartment costs 50% more to rent than a one-bedroom apartment. If Alex were to rent a two-bedroom apartment for X months it would cost him the same amount as it would to rent a one-bedroom for 12 months. We''re asked for the value of X. This question can be ...” December 20, 2018 Rich.C@EMPOWERgmat.com posted a reply to 90 Day Flexible Plan for a decent verbal/low quant old score in the GMAT Strategy forum “Hi LDCross, This 610 is a strong initial CAT Score (the average Score on the Official GMAT hovers around 550 most years) - and your Verbal Scaled Score is fantastic. As such, you might just need to put the proper focus/effort into building up your Quant knowledge and learning/practicing the ...” December 20, 2018 Brent@GMATPrepNow posted a reply to If sequence S has 120 terms, what is the 105th term of S? in the Data Sufficiency forum “Target question: What is the 105th term of S? Given: Sequence S has 120 terms Statement 1: The first term of S is −8. We have no information about the nature of the sequence. So, knowing the value of term 1 won''t help is determine the value of term 105 Since we cannot answer the ...” December 20, 2018 Brent@GMATPrepNow posted a reply to Two dice, each with six sides numbered 1 through 6, are toss in the Problem Solving forum “P(both dice will come up with either a 1 or a 2) = P(1st die is 1 or 2 AND 2nd die is 1 or 2) = P(1st die is 1 or 2) x P(2nd die is 1 or 2) = 2/6 x 2/6 = 1/3 x 1/3 = 1/9 Answer: C Cheers, Brent” December 20, 2018 Brent@GMATPrepNow posted a reply to At the Trenchard Oaks apartment complex, a two-bedroom apart in the Problem Solving forum “A fast and easy approach is to assign a "nice" value to the monthly rent of a ONE-bedroom apartment. Let''s say the rent on a ONE-bedroom apartment is$100 per month A two-bedroom apartment costs 50% more to rent than a one-bedroom apartment 50% of $100 =$50 So, the rent on a ...”
December 20, 2018
Brent@GMATPrepNow posted a reply to If the remainder when positive integer x is divided by 7 is in the Data Sufficiency forum
“Target question: What is the value of x? Given: If the remainder when positive integer x is divided by 7 is 4 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 ...”
December 20, 2018
Max@Math Revolution posted a new topic called 120 tickets are to be evenly distributed to n people. If n in the Problem Solving forum
“[Math Revolution GMAT math practice question] 120 tickets are to be evenly distributed to n people. If n is greater than 1 and the number of tickets given to each person is greater than 1, what is the greatest possible value of n from choices? A. 9 B. 10 C. 12 ...”
December 20, 2018
Max@Math Revolution posted a reply to (0.0004)(0.000005)/200,000 is equal to which of the followin in the Problem Solving forum
“=> (0.0004)(0.000005)/200,000 = {4*5*(0.0001)(0.000001)}/{2*100,000} = (2*10^1*10^-4*10^-6)/ (2*10^5) = (10^-9)/(10^5) = 10^-14 Therefore, the answer is B. Answer: B”
December 20, 2018
Max@Math Revolution posted a new topic called Is |m-n|=|m|-|n| ? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] Is |m-n|=|m|-|n| ? 1) m-n = 0 2) n = 0”
December 20, 2018
Max@Math Revolution posted a reply to x and y are positive integers. Is y an even integer? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...”
December 20, 2018
Brent@GMATPrepNow posted a reply to The value of a share was 25% less in the 2nd quarter over in the Problem Solving forum
“Let''s assign a nice value to the share value in the 1st quarter. Let''s say the share value in the 1st quarter = $100 The value of a share was 25% less in the 2nd quarter over the 1st quarter . . . So, the share value in the 2nd quarter =$100 - (25% of $100) =$100 - $25 =$75 . . . ...”
December 20, 2018
Brent@GMATPrepNow posted a reply to The usual price of a bagel was reduced during a sale. How 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 ...” December 20, 2018 Brent@GMATPrepNow posted a reply to One woman and one man can build a wall together in two hours in the Problem Solving forum “One approach is to determine the size of the job One woman and one man can build a wall together in two hours, but the woman would need the help of two girls in order to complete the same job in the same amount of time. The part in blue tells us that 2 girls have the same output as 1 man. ...” December 19, 2018 Brent@GMATPrepNow posted a reply to Is x > 0 ? (1) |x+3| < 4 (2) |x-3| < 4 in the Data Sufficiency forum “When solving inequalities involving ABSOLUTE VALUE, there are 2 things you need to know: Rule #1: If |something| < k, then –k < something < k Rule #2: If |something| > k, then EITHER something > k OR something < -k Target question: Is x > 0 ? Statement 1: |x+3| < ...” December 19, 2018 Brent@GMATPrepNow posted a reply to In the xy-plane, what is the y-intercept of line l? in the Data Sufficiency forum “Target question: What is the y-intercept of line L? IMPORTANT: When I scan the two statements, I see that they are strongly related. If the x-intercept is -1/3 (as per statement 2), the slope of the line is GUARANTEED to be 3 times its y-intercept (as per statement 1). Here''s why... ...” December 19, 2018 Brent@GMATPrepNow posted a reply to At garage sale, all of the prices of the items sold were in the Problem Solving forum “The price of the radio was the 15th highest price So, there were 14 items that were more expensive than the radio. In other words, if we listed all of the prices in ascending order, we''d get something like: ........... radio, X, X, X, X, X, X, X, X, X, X, X, X, X, X The price of the radio ...” December 19, 2018 Brent@GMATPrepNow posted a reply to A certain company charges$6 per package to ship packages in the Problem Solving forum
“Let x = the weight of the package (in pounds) So, the shipping cost = $6 + 2x We''re told the shipping cost is$38. So, we can write: 6 + 2x = 38 Subtract 6 from both sides: 2x = 32 Solve: x = 32/2 = 16 Answer: A Cheers, Brent”
December 19, 2018
Brent@GMATPrepNow posted a reply to Is x/y>1? in the Data Sufficiency forum
“Target question: Is x/y > 1? Statement 1: x > y Let''s TEST some values. There are several values of x and y that satisfy statement 1. Here are two: Case a: x = 3 and y = 1. In this case, x/y = 3/1 = 3. So, the answer to the target question is YES, x/y IS greater than 1 Case b: x = ...”
December 19, 2018
Brent@GMATPrepNow posted a reply to How many 4-digit numbers greater than 3,000 have the digits: in the Problem Solving forum
“Take the task of creating 4-digit numbers and break it into stages. We’ll begin with the most restrictive stage. Stage 1: Select the first digit (to go in the thousands place) Since the 4-digit number must be GREATER THAN 3000, the first digit must be greater than or equal to 3 This means ...”
December 19, 2018
Max@Math Revolution posted a new topic called How many 4-digit numbers greater than 3,000 have the digits: in the Problem Solving forum
“[Math Revolution GMAT math practice question] How many 4-digit numbers greater than 3,000 have the digits: 1, 3, 5, and 7? A. 6 B. 9 C. 12 D. 15 E. 18”
December 19, 2018
Max@Math Revolution posted a reply to In the coordinate plane, the y-intercept of the line k is eq in the Problem Solving forum
“=> The equation of line k has the form, y = mx + b, where m is the slope and b is the y-intercept. Let m be the slope of line k. Then b = 2m, and the equation is y = mx + 2m = m(x+2). The x-intercept of line k is -2, since -2 is a root of m(x+2)=0. Therefore, the answer is A. Answer: ...”
December 19, 2018
Max@Math Revolution posted a new topic called Is x/y>1? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] Is x/y>1? 1) x>y 2) x-y>1”
December 19, 2018
Max@Math Revolution posted a reply to [x] is the greatest integer less than or equal to x. <x&a in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. [ x ] is ...”
December 19, 2018
Brent@GMATPrepNow posted a reply to Bite-sized video lessons from GMAT Prep Now in the GMAT Math forum
“Shortcut for quickly dividing by 5 in your head Video: https://www.youtube.com/watch?v=fK29jTSJOi8 Cheers, Brent”
December 18, 2018
Rich.C@EMPOWERgmat.com posted a reply to In the set of positive integers from 1 to 500, what is the s in the Problem Solving forum
“Hi All, We''re asked for the sum of all the ODD multiples of 5 from 1 to 500. This question is essentially about Arithmetic and can be solved with ''bunching.'' There are 100 multiples of 5 between 1 and 500: 1(5)..... (100)(5), but the question asks for only the ODD multiples of 5 (meaning ...”
December 18, 2018
Brent@GMATPrepNow posted a reply to At a certain university, the ratio of the number of teaching in the Problem Solving forum
“We can solve this using equivalent ratios We''re comparing teaching assistants/number of students Let x = number of students possible We can write: 5/x = 3/80 Cross multiply to get: 3x = (5)(80) Simplify: 3x = 400 Solve: x = 400/3 = 133 1/3 = 133.3333 Since 134 students would exceed ...”
December 18, 2018
Brent@GMATPrepNow posted a reply to Automobile A is traveling at two-thirds the speed that in the Data Sufficiency forum
“ Given: Automobile A is traveling at two-thirds the speed that Automobile B is traveling. Let A = Car A''s speed Let B = Car B''s speed So, we can write: A = (2/3)B Target question: What is the value of A? Statement 1: If both automobiles increased their speed by 10 miles per hour, ...”
December 18, 2018
Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum
“To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...”
December 18, 2018
Max@Math Revolution posted a new topic called (0.0004)(0.000005)/200,000 is equal to which of the followin in the Problem Solving forum
“[Math Revolution GMAT math practice question] (0.0004)(0.000005)/200,000 is equal to which of the following? A. 10^-15 B. 10^-14 C. 10^-13 D. 10^-12 E. 10^-11”
December 18, 2018
Max@Math Revolution posted a new topic called x and y are positive integers. Is y an even integer? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] x and y are positive integers. Is y an even integer? 1) x^2+x=y+2 2) x = 2”
December 18, 2018
Rich.C@EMPOWERgmat.com posted a reply to Seven students are trying out for the school soccer team, on in the Problem Solving forum
“Hi alanforde800Maximus, This question uses what''s called "Formal Logic" (a concept that you would see repeatedly on the LSAT, but rarely on the GMAT). You can answer it with some drawings and careful note-taking. Based on the information in the prompt, we have seven players ...”
December 17, 2018
Rich.C@EMPOWERgmat.com posted a reply to Pam and Robin each roll a pair of fair, six-sided dice. What in the Problem Solving forum
“Hi alanforde800Maximus, This is a tougher probability question than average (and you likely will not see this exact situation on Test Day). This is meant to say that you shouldn''t be too concerned about this prompt until you''re picking up points in all the other ''gettable'' areas first. ...”
December 17, 2018
Rich.C@EMPOWERgmat.com posted a reply to If every boy in a kindergarten class buys a soda and every g in the Problem Solving forum
“Hi alanforde800Maximus, This is a thick, layered question, and would likely take most Test Takers more time than average to solve correctly. The key to solving it is to realize that we don''t know the prices of each soda and each juice box - they MIGHT be integers, but they MIGHT NOT. Also, we ...”
December 17, 2018
Rich.C@EMPOWERgmat.com posted a reply to Post-First Exam: What are my next steps? in the GMAT Strategy forum
December 17, 2018
Rich.C@EMPOWERgmat.com posted a reply to 90 Day Flexible Plan for a decent verbal/low quant old score in the GMAT Strategy forum
“Hi LDCross, Earlier this year, GMAC made a formal announcement defining some changes that would be taking place to the format of the Official GMAT (which began April 16, 2018). These changes primarily impact the overall length of the Exam (meaning the number of questions in the Quant and Verbal ...”
December 17, 2018
Brent@GMATPrepNow posted a reply to If every boy in a kindergarten class buys a soda and every g in the Problem Solving forum
“Let B = # of boys in kindergarten Let G = # of girls in kindergarten Let J = price (in CENTS) of ONE juice box Let S = price (in CENTS) of ONE soda If every boy in a kindergarten class buys a soda and every girl in the same class buys a juice box, the class will spend 1¢ less in total than it ...”
December 17, 2018
Brent@GMATPrepNow posted a reply to Sanjana jogged uphill for a while at an average speed of 3 m in the Problem Solving forum
“You could also try testing the answer choices. Cheers, Brent”
December 17, 2018
Brent@GMATPrepNow posted a reply to If 3x + 12 = 21, then x + 4 = A. 3 B. 4 C. 5 D. 7 E. 9 in the Problem Solving forum
“One option is to first solve the equation, 3x + 12 = 21, for x, and then determine the value of x+4. Alternatively, we can factor the left side to get: 3(x + 4) = 21 Now divide both sides by 3 to get: x + 4 = 7 Answer: D Cheers, Brent”
December 17, 2018
Brent@GMATPrepNow posted a reply to If a, b & c are integers, is abc odd? in the Data Sufficiency forum
“Some important rules: #1. (ODD)(ODD) = ODD #2. (ODD)(EVEN) = EVEN #3. (EVEN)(EVEN) = EVEN Given: a, b & c are integers Target question: Is abc odd? Statement 1: ab is odd This tells us that a and b are both odd. However, we have no information about c. Consider these two ...”
December 17, 2018
Brent@GMATPrepNow posted a reply to In the coordinate plane, the y-intercept of the line k is eq in the Problem Solving forum
“One approach is to choose some values that meet the given information. In the coordinate plane, the y-intercept of the line k is equal to twice its slope. Okay, so let''s say the y-intercept of line k is 6. We get: https://i.imgur.com/qJ5GeRQ.png Since the y-intercept (6) is TWICE the ...”
December 17, 2018
Max@Math Revolution posted a new topic called In the coordinate plane, the y-intercept of the line k is eq in the Problem Solving forum
“[Math Revolution GMAT math practice question] In the coordinate plane, the y-intercept of the line k is equal to twice its slope. The y-intercept is not 0. What is the x-intercept of the line k? A. -2 B. -1 C. 0 D. 1 E. 2”
December 17, 2018
Max@Math Revolution posted a new topic called [x] is the greatest integer less than or equal to x. <x> is in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] [x] is the greatest integer less than or equal to x. < x > is the least integer greater than or equal to x. What is the value of x? 1) [x] = 2 2) < x > = 2”
December 17, 2018
Max@Math Revolution posted a reply to Seven small circles of radius 2 are cut from the large circl in the Problem Solving forum
“=> https://i.postimg.cc/YGKPdjFr/12-17.png The radius of the large circle is 2*2 + 2 = 6. Thus, the area of the large circle is 6^2π = 36π, and the area of each of the seven small circles is 2^2π = 4π. Thus, the area of the shaded region is 36π – 7(4π) = 8π. Therefore, the ...”
December 17, 2018
Max@Math Revolution posted a reply to How many subsets of {1,2,3,4,5,6,7,8} contain at least one p in the Problem Solving forum
“=> It is easiest to use complementary counting. That is, count the number of subsets that contain no prime number and subtract it from the total number of subsets. The number of subsets containing no prime number is the number of subsets of { 1, 4, 6, 8 }. Note that 1 is neither a prime ...”
December 17, 2018
Max@Math Revolution posted a reply to When n is a positive integer, is n / 4 an integer? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 17, 2018
Max@Math Revolution posted a reply to If m and n are positive integers, is mn an even number? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 17, 2018
Brent@GMATPrepNow posted a reply to Sanjana jogged uphill for a while at an average speed of 3 m in the Problem Solving forum
“Let''s start with a "Word Equation" (distance traveled uphill) + (distance traveled downhill) = TOTAL DISTANCE Let t = the time spent jogging UPHILL (in hours) The total travel time = 40 minutes = 2/3 HOURS So, 2/3 - t = the time spent jogging DOWNHILL (in hours) Distance = ...”
December 16, 2018
Brent@GMATPrepNow posted a reply to If one manual weighs 400 grams, how many kilograms does a in the Problem Solving forum
“Since the answer choices are VERY SPREAD APART, we can be quite aggressive with our ESTIMATION. (400 grams)(50 manuals) = 20,000 grams = 20 KILOgrams So, the answer is approximately 20 Answer: C Cheers, Brent”
December 16, 2018
Rich.C@EMPOWERgmat.com posted a reply to In 1991, the price of a house was 80% of its original price. in the Problem Solving forum
“Hi All, We''re told that in 1991, the price of a house was 80% of its original price and in 1992, the price of the house was 60% of its original price. We''re asked by what percent the price of the house decreased from 1991 to 1992. This question can be solved in a couple of different ways, ...”
December 16, 2018
Rich.C@EMPOWERgmat.com posted a reply to A mathematician has devised a formula that produces a series in the Problem Solving forum
“Hi All, In this question, we''re given the ''rules'' for a particular sequence. We have the values of the first 3 terms and instructions for how to calculate each term afterwards (re: the 4th term is the sum of TWICE the term before it and the term ''2 terms'' before it - re: 2(3rd term) + 2nd ...”
December 16, 2018
Rich.C@EMPOWERgmat.com posted a reply to Each Machine of type A has 3 steel parts and 2 chrome parts. in the Problem Solving forum
“Hi All, We''re told that each Machine of type A has 3 steel parts and 2 chrome parts, each machine of type B has 4 steel parts and 7 chrome parts and a certain group of type A and type B machines has a total of 20 steel parts and 22 chrome parts. We''re asked for the total number of machines. ...”
December 16, 2018
Rich.C@EMPOWERgmat.com posted a reply to The main ingredient in a certain prescription drug capsule in the Problem Solving forum
“Hi All, We''re told that the main ingredient in a certain prescription drug capsule cost $500 per kilogram. If each capsule contains 600 milligrams of ingredient, what is the cost of the ingredient in a capsule? (1 kilogram = 10^6 milligrams). This is a ''unit conversion'' question and comes ...” December 16, 2018 Rich.C@EMPOWERgmat.com posted a reply to how to ace GMAT in the GMAT Strategy forum “Hi Sana Mehra, 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 how you''ve been studying and your goals: Studies: 1) What type of study routine have you followed? How many hours do you typically study each ...” December 16, 2018 Brent@GMATPrepNow posted a reply to Madge paid A dollars for R bananas. Dean paid B dollars for in the Data Sufficiency forum “ Given: Madge paid A dollars for R bananas. Dean paid B dollars for S bananas. Target question: Which one of them paid a higher price-per-banana? Statement 1: B > A This tells us that Dean PAID more than Madge paid. However, we don''t know HOW MANY bananas each person bought. ...” December 15, 2018 Brent@GMATPrepNow posted a reply to Jason's salary and Karen's salary were each p percent in the Data Sufficiency forum “Target question: What is the value of p? Given: Jason''s salary and Karen''s salary were each p percent greater in 1998 than in 1995. IMPORTANT: If my 1998 salary is p percent greater than my 1995 salary, then: 1998 salary = (1 + p/100)(1995 salary) For example, if my 1998 salary is 7 percent ...” December 15, 2018 Brent@GMATPrepNow posted a reply to If w + 2x = 150, 2w + 3y = 100, and x + 3z = 50, what is the in the Problem Solving forum “GIVEN: w + 2x = 150 2w + 3y = 100 x + 3z = 50 If we add all 3 equations, we get: 3w + 3x + 3y + 3z = 300 Divide both sides by 3 to get: w + x + y + z = 100 Answer: D Cheers, Brent” December 15, 2018 Max@Math Revolution posted a new topic called Seven small circles of radius 2 are cut from the large circl in the Problem Solving forum “https://i.postimg.cc/6TkwQPCF/12-14.png A. 8 π B. 20 π C. 32 π D. 48 π E. 64 π” December 14, 2018 Max@Math Revolution posted a reply to How many perfect squares lie between 2^4 and 2^8, inclusive? in the Problem Solving forum “=> We need to count the number of integers n satisfying 2^4 ≤ n^2 ≤ 2^8 or 2^2 ≤ n ≤ 2^4. The number of integers satisfying 2^2 ≤ n ≤ 2^4 is 2^4 – 2^2 + 1 = 16 – 4 + 1 = 13. Therefore, the answer is B. Answer: B” December 14, 2018 Max@Math Revolution posted a new topic called When n is a positive integer, is n / 4 an integer? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] When n is a positive integer, is n / 4 an integer? 1) n - 1 is not divisible by 2 2) n + 1 is not divisible by 2” December 14, 2018 Max@Math Revolution posted a reply to If n is a positive integer, is in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Condition ...” December 14, 2018 Brent@GMATPrepNow posted a reply to If A is the center of the circle shown above and AB = BC in the Problem Solving forum “First recognize that all radii (indicated with BLUE lines) have equal length https://i.imgur.com/iz8ur0Z.png Since BC and CD are both equal to the radius AB, we can see that all BLUE lines have equal length https://i.imgur.com/mF0UxTp.png This means the 2 blue triangles are EQUILATERAL ...” December 13, 2018 Brent@GMATPrepNow posted a reply to If m and n are positive integers, is mn an even number? 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 mn an even number? Given: m and n are positive integers Statement 1: m/n is an even number. ...” December 13, 2018 Brent@GMATPrepNow posted a reply to What distance did Jane travel? in the Data Sufficiency forum “Target question: What distance did Jane travel? Statement 1: Bill traveled 40 miles in 40 minutes. No info about Jane Statement 1 is NOT SUFFICIENT Statement 2: Jane traveled at the same average rate as Bill We don''t know Bill''s speed (rate) Statement 2 is NOT SUFFICIENT ...” December 13, 2018 Max@Math Revolution posted a new topic called How many subsets of {1,2,3,4,5,6,7,8} contain at least one p in the Problem Solving forum “[Math Revolution GMAT math practice question] How many subsets of {1,2,3,4,5,6,7,8} contain at least one prime number? A. 60 B. 120 C. 150 D. 180 E. 240” December 13, 2018 Max@Math Revolution posted a reply to The quadrilateral ABCD is a square with sides of length 12. in the Problem Solving forum “=> To find the area of the shaded quadrilateral, we need to subtract the areas of triangles ABE and BCF from the area of square ABCD. We can position the square in the xy-plane as shown in the diagram below. https://i.postimg.cc/kBnNMpJJ/12-13.png The equations of AC and BE are y ...” December 13, 2018 Max@Math Revolution posted a new topic called If m and n are positive integers, is mn an even number? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] If m and n are positive integers, is mn an even number? 1) m/n is an even number. 2) m + n is an even number.” December 13, 2018 Max@Math Revolution posted a reply to If x and y are positive integers and in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” December 13, 2018 Rich.C@EMPOWERgmat.com posted a reply to Test day in the GMAT Strategy forum “Hi Esteban, I received your email and wrote back with an analysis of your ESR and some additional questions. GMAT assassins aren''t born, they''re made, Rich” December 13, 2018 Brent@GMATPrepNow posted a reply to If Mike buys a biclycle and a helmet for a total cost of in the Data Sufficiency forum “Target question: How much does the helmet cost? Given: bicycle + helmet =$315 Statement 1: The bicycle costs twice as much as the helmet. Let x = cost of helmet So, 2x = cost of bicycle Since the total cost is $315, we can write: x + 2x = 315 Simplify: 3x = 315 Solve: x = 315/3 = ...” December 13, 2018 Rich.C@EMPOWERgmat.com posted a reply to Test day in the GMAT Strategy forum “Hi Esteban, Is your Official Score in the ''competitive range'' of what those Schools are looking for? If it''s not, and you want to retest, then you''ll have to be really efficient with the time that you have remaining before the Round 2 application deadlines. You might choose to purchase ...” December 13, 2018 Brent@GMATPrepNow posted a reply to In isosceles triangle DEF, what is the measure of angle E? in the Data Sufficiency forum “Target question: What is the measure of ∠E? Given: Triangle DEF is an ISOSCELES triangle This tells us that there are 2 equal angles Statement 1: ∠D measures 42 degrees Here it''s hard to tell whether there''s a second 42-degree angle or whether the other two angles are different. ...” December 12, 2018 Brent@GMATPrepNow posted a reply to Ramon wants to cut a rectangular board into identical square in the Problem Solving forum “If we aren''t wasting any wood, the length and width must be divisible by one side of the square So, this question is a clever way of asking us what the greatest common divisor (GCD) of 18 and 30 The GCD of 18 and 30 is 6, so if we cut squares that are 6 x 6, then we won''t waste any wood. We ...” December 12, 2018 ceilidh.erickson posted a reply to GMAT Experience - Looking for advice in the I just Beat The GMAT! forum “Your scores have been pretty inconsistent, with both quant & verbal fluctuating a lot. Given that, a 660 result is not surprising. Inconsistency on quant almost always indicates CARELESS ERRORS or sloppy technique - sometimes you get lucky, sometimes you don''t. A lot of students brush off ...” December 12, 2018 ceilidh.erickson posted a reply to 660 GMAT - What are my odds? in the The Application Process forum “It really depends on where you''re applying, and how much you stand out against other applicants in the pool. For example, applicants from France might be underrepresented in certain pools, as opposed to applicants from other countries. I''d recommend doing free consultations with any admissions ...” December 12, 2018 ceilidh.erickson posted a reply to Test day in the GMAT Strategy forum “For anyone else with questions about test day & scores, here''s an article I wrote: https://www.manhattanprep.com/gmat/blog/scheduling-your-gmat-everything-you-need-to-know-about-booking-cancelling-reporting-etc/” December 12, 2018 Brent@GMATPrepNow posted a reply to How many perfect squares lie between 2^4 and 2^8, inclusive? in the Problem Solving forum “First rewrite 2^4 and 2^8 as SQUARES of integers (aka perfect squares) 2^4 = (2²)² = 4² 2^8 = (2^4)² = 16² So, we want to find the number of perfect squares FROM 4² to 16² inclusive Let''s list them: 4², 5², 6², 7², 8², 9², 10², 11², 12², 13², 14², 15², and 16² There are ...” December 12, 2018 Brent@GMATPrepNow posted a reply to If 5x + 3y = 17, what is the value of x? in the Data Sufficiency forum “Target question: What is the value of x? Given: 5x + 3y = 17 Statement 1: x is a positive integer Let''s TEST some values. There are several values of x and y that satisfy statement 1. Here are two: Case a: x = 1 and y = 4 (these values satisfy the given equation, 5x + 3y = 17). In ...” December 12, 2018 Max@Math Revolution posted a new topic called How many perfect squares lie between 2^4 and 2^8, inclusive? in the Problem Solving forum “[Math Revolution GMAT math practice question] How many perfect squares lie between 2^4 and 2^8, inclusive? A. 12 B. 13 C. 15 D. 18 E. 20” December 12, 2018 Max@Math Revolution posted a reply to What is the solution set of (1+|x|)(1+x) > 0? in the Problem Solving forum “=> Since 1+|x| > 0, we can divide both sides of the inequality by 1 + |x| to obtain 1+x > 0 or x > -1. Therefore, the answer is A. Answer: A” December 12, 2018 Max@Math Revolution posted a new topic called If n is a positive integer, is in the Data Sufficiency forum “[Math Revolution GMAT math practice question] If n is a positive integer, is $$\sqrt{n+1}$$ an integer? 1) n is a multiple of 8 2) n is the product of 2 consecutive even numbers” December 12, 2018 Max@Math Revolution posted a reply to [x] is the greatest integer less than or equal to x. What is in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. [x] is ...” December 12, 2018 Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum “To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...” December 12, 2018 Rich.C@EMPOWERgmat.com posted a reply to If the ratio of the present age of Anna and Paula is 1 : 2, in the Problem Solving forum “Hi All, We''re told that the ratio of Anna''s and Paula''s CURRENT ages is 1:2. We''re asked which of the following COULD have been the ratio of their respective ages 8 years ago. This question can be solved in a couple of different ways, including by ''brute force'' Arithmetic. Since we''re ...” December 11, 2018 Rich.C@EMPOWERgmat.com posted a reply to The table above shows the number of students in three clubs in the Problem Solving forum “Hi All, 3-Group Overlapping Sets questions are relatively rare on the Official GMAT (you likely will NOT see this version of Overlapping Sets on Test Day). However, there is a formula that you can use to solve it. Total = (1st group) + (2nd group) + (3rd group) - (1st and 2nd) - (1st and ...” December 11, 2018 Rich.C@EMPOWERgmat.com posted a reply to Test day in the GMAT Strategy forum “Hi Esteban, How did you Score (including the Quant and Verbal Scaled Scores)? And are you planning to apply soon (sometime in the next couple of months)? GMAT assassins aren''t born, they''re made, Rich” December 11, 2018 Brent@GMATPrepNow posted a reply to How many integers between 324,700 and 458,600 have tens in the Problem Solving forum “We want to determine how many integers end in 13 For example, 324713, 324813, 324913, 325013, . . . etc. Recognize that, for every 100 consecutive integers, only 1 will end in 13. There are 133,900 integers between 324,700 and 458,600 (since 458,600 - 324,700 = 133,900) Of those 133,900 ...” December 11, 2018 Brent@GMATPrepNow posted a reply to The quadrilateral ABCD is a square with sides of length 12. in the Problem Solving forum “This question could take a while to answer (especially if you don''t know where to begin! :-). Fortunately, we can take advantage of an IMPORTANT feature about geometric diagrams on the GMAT: The diagrams in GMAT problem solving questions are DRAWN TO SCALE unless stated otherwise. We have ...” December 11, 2018 Brent@GMATPrepNow posted a reply to A palindrome is a number that reads the same forward and in the Problem Solving forum “Take the task of building palindromes and break it into stages. Stage 1: Select the ten-thousands digit We can choose 1, 2, or 3 So, we can complete stage 1 in 3 ways Stage 2: Select the thousands digit We can choose 1, 2, or 3 So, we can complete stage 2 in 3 ways Stage 3: Select ...” December 11, 2018 Max@Math Revolution posted a new topic called The quadrilateral ABCD is a square with sides of length 12. in the Problem Solving forum “https://i.postimg.cc/p5Kw4Bv5/12-11.png A. 30 B. 45 C. 60 D. 75 E. 90” December 11, 2018 Max@Math Revolution posted a new topic called If x and y are positive integers and in the Data Sufficiency forum “[Math Revolution GMAT math practice question] If x and y are positive integers and $$y=\sqrt{5-x}$$ then y=? 1) x>1 2) y<2” December 11, 2018 Brent@GMATPrepNow posted a reply to This year, a woman has a lucrative one-year position. During in the Problem Solving forum “Let T = the woman''s total salary for the year During this year, she will give a fraction f of her salary to her husband, a private investor, to invest and they will live this year on the remainder. So, the amount SAVED (and then given to huspand)= fT This means the amount SPENT = T - fT ...” December 11, 2018 Brent@GMATPrepNow posted a reply to A frog is climbing a greasy pole. The frog can climb 2 in the Problem Solving forum “Let''s solve this by making table Time elapsed | height 1 hours | 4 cm 2 hours | 8 cm REST (slide) 2.5 hours | 7 cm 3.5 hours | 11 cm 4.5 hours | 15 cm REST (slide) 5 hours | 14 cm 6 hours | 18 cm 7 hours | 22 cm REST (slide) 7.5 hours | 21 cm 8.5 hours | 25 cm 9.5 hours | 29 cm ...” December 11, 2018 Brent@GMATPrepNow posted a reply to Oil, vinegar, and water are mixed in a 3 to 2 to 1 ratio to in the Problem Solving forum “GIVEN: oil: vinegar : water = 3 : 2 : 1 Let''s first try to use ALL 8 cups of oil Take 3 : 2 : 1 and multiply all 3 parts by 8/3 to get the EQUIVALENT ratio 8 : 16/3 : 8/3 Simplify to get: 8 : 5 1/3 : 2 2/3 So, in this case, the dressing is comprised of 8 cups of oil, 5 1/3 cups of vinegar, ...” December 10, 2018 Brent@GMATPrepNow posted a reply to Line DB divides Rectangle ABCD into two equal triangles. Is in the Data Sufficiency forum “IF all 4 sides of the rectangle have EQUAL length (i.e,, the shape is a square), then the diagonal will create two 45-45-90 right triangles. However, if the sides are not all the same length, the resulting triangles will NOT be 45-45-90 right triangles. Cheers, Brent” December 10, 2018 Brent@GMATPrepNow posted a reply to A father distributed his total wealth to his two sons. How in the Data Sufficiency forum “ Given: A father distributed his total wealth to his two sons. Target question: How much wealth did the father have? Statement 1: The elder son received 3/5 of the wealth. Without any dollar values, there''s no way to answer the target question with certainty. So, statement 1 is NOT ...” December 10, 2018 Brent@GMATPrepNow posted a reply to At what speed was Erik running when he was at the halfway po in the Data Sufficiency forum “IMPORTANT: The two statements essentially provide the exact same information. If it took Erik 2 hours to travel 10 miles, we can conclude that his average speed was 5 miles per hour. When the two statements provide the same information in a Data Sufficiency question, the correct answer must be ...” December 10, 2018 Brent@GMATPrepNow posted a reply to [x] is the greatest integer less than or equal to x. What is in the Data Sufficiency forum “Here are a few similar questions to practice with: - https://www.beatthegmat.com/if-is-the-greatest-integer-less-than-or-equal-to-x-what-t302459.html - https://www.beatthegmat.com/g-x-is-the-greatest-integer-less-than-or-equal-to-x-t298237.html - ...” December 10, 2018 Max@Math Revolution posted a new topic called What is the solution set of (1+|x|)(1+x) > 0? in the Problem Solving forum “[Math Revolution GMAT math practice question] What is the solution set of (1+|x|)(1+x) > 0? A. x > -1 B. x < -1 C. x < 0 D. x > 0 E. x > 1” December 10, 2018 Max@Math Revolution posted a new topic called [x] is the greatest integer less than or equal to x. What is in the Data Sufficiency forum “[Math Revolution GMAT math practice question] [x] is the greatest integer less than or equal to x. What is the value of x? 1) [x] = 2 2) x is an integer” December 10, 2018 Rich.C@EMPOWERgmat.com posted a reply to Test day in the GMAT Strategy forum “Hi Esteban, The Program has a searchable database, so you don''t have to memorize any codes for the Schools that you want to send your Official GMAT Score to. Is your Official Test Date coming up (and when are you scheduled to take the Test?)? GMAT assassins aren''t born, they''re made, Rich” December 10, 2018 Max@Math Revolution posted a reply to Which of the following equations is satisfied by x=1+√2? in the Problem Solving forum “=> x=1+√2 => x – 1 = √2 => (x-1)^2 = (√2)^2 => x^2 – 2x + 1 = 2 => x^2 – 2x - 1 = 0. Therefore, the answer is A. Answer: A” December 10, 2018 Max@Math Revolution posted a reply to Tom saved$10,000 at a constant compound interest rate of r in the Problem Solving forum
“=> After 10 years, we have 10,000(1+r)^10 = 20,000 or (1+r)^10 = 2. So, after 30 years the balance is 10,000(1+r)^30 = 10,000((1+r)^10)^3= 10,000*2^3 =10,000*8 = 80,000. Therefore, the answer is E. Answer: E”
December 10, 2018
Max@Math Revolution posted a reply to Is x > y? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...”
December 10, 2018
Max@Math Revolution posted a reply to If a and b are integers, is a-b an even number? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...”
December 10, 2018
Rich.C@EMPOWERgmat.com posted a reply to When 6 is multiplied by x, the result is the same as when x in the Problem Solving forum
“Hi All, We''re told that when 6 is multiplied by X, the result is the SAME as when X is added to 9. We''re asked for the value of X/3. When dealing with GMAT questions, it''s important to make sure that you answer the question that is ASKED. Here, we''re NOT asked for the value of X, we''re ...”
December 9, 2018
Brent@GMATPrepNow posted a reply to When 6 is multiplied by x, the result is the same as when x in the Problem Solving forum
“When 6 is multiplied by x, the result is the same as when x is added to 9 In other words: 6x = 9 + x Subtract x from both sides: 5x = 9 Divide both sides by 5 to get: x = 9/5 Answer: E Cheers, Brent”
December 9, 2018
Brent@GMATPrepNow posted a reply to Three photographers, Lisa, Mike and Norm, take photos of a w in the Problem Solving forum
“We can also solve the question using 1 variable Norms photos number 10 more than twice the number of Lisa''s photos Let x = the number of photographs that Lisa took. So, 2x + 10 = the number of photographs that Norm took. The total of Lisa and Mikes photos is 50 less than the sum of ...”
December 9, 2018
Brent@GMATPrepNow posted a reply to At a certain factory, each employee working the second shift in the Problem Solving forum
“Let''s assign a "nice" value to the number of widgets made by ONE employee. We''ll also assign a nice value to the number of employees on each shift. At a certain factory, each employee working the SECOND shift produced 2/3 as many widgets as each employee working the FIRST shift. ...”
December 9, 2018
Brent@GMATPrepNow posted a reply to If two of the four expressions x+y, x+5y, x-y, and 5x-y are in the Problem Solving forum
“Okay, first recognize that x² - (by)² is a DIFFERENCE OF SQUARES. Here are some examples of differences of squares: x² - 25y² 4x² - 9y² 49m² - 100k² In general, we can factor differences of squares as follows: a² - b² = (a-b)(a+b) So . . . x² - 25y² = (x+5y)(x-5y) 4x² - ...”
December 8, 2018
ceilidh.erickson posted a reply to If all of the telephone extensions in a certain company must in the Problem Solving forum
“Here is yet another solution: Most of the time when we''re arranging n things (people in a line, letter combinations, etc) with a diminishing pool (i.e. we can''t use the same item twice), the number of arrangements is simply n!. If we could arrange these 4 numbers into extensions without any ...”
December 7, 2018
ceilidh.erickson posted a reply to Arthmetic subsequent value Problem Solving question in the Problem Solving forum
“If each row had 2 more spaces than the previous, we could imagine this as CONSECUTIVE SUM formula: sum = (average)(# of terms) The average of a consecutive set = the average of the endpoints --> (biggest + smallest)/2 The # of terms = the difference between the biggest and the smallest, divided ...”
December 7, 2018
ceilidh.erickson posted a reply to Goronian lawmaker: Goronia's Cheese Importation Board, the a in the Critical Reasoning forum
“For more on this YES / NO test for EVALUATE questions, see: https://www.beatthegmat.com/guitar-strings-often-go-dead-become-less-respon-t304393.html#820897 https://www.beatthegmat.com/because-of-a-rare-type-of-fungus-that-killed-off-many-cacao-t304283.html#820187”
December 7, 2018
ceilidh.erickson posted a reply to Goronian lawmaker: Goronia's Cheese Importation Board, the a 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: - Goronia''s Cheese Importation Board rejects about one percent of the cheese that it inspects. - the ...”
December 7, 2018
ceilidh.erickson posted a reply to 700-800 Level Questions in the GMAT Math forum
“If you''re looking for ultra-difficult problems to practice with, I recommend checking out the Manhattan Prep Advanced Quant guide. (Forgive the plug. As yet, there''s no easy way to access OG problems by difficulty level). This book contains strategies that specifically pertain to high-level ...”
December 7, 2018
Brent@GMATPrepNow posted a new topic called CHALLENGE: What is the value of k? in the Data Sufficiency forum
“What is the value of k? $$(1) k^2-5k-66=0$$ $$(2) \frac{2k}{k^2+5k}=\frac{1}{8}$$ Source: www.gmatprepnow.com Answer: B Estimated difficulty level: 600-650”
December 7, 2018
ceilidh.erickson posted a reply to Economist: On average, the emergency treatment for an elderl in the Critical Reasoning forum
“This argument style is very common on the GMAT: it compares 2 things (cost of emergency care v. cost of therapeutic program) but fails to take into account any other factors. Here are some other CR questions with similar logical flaws: ...”
December 7, 2018
ceilidh.erickson posted a reply to Economist: On average, the emergency treatment for an elderl in the Critical Reasoning forum
“To WEAKEN an argument, we must first find the logical flaws / unstated assumptions in the argument. Premises: - On average, the emergency treatment for an elderly person for injuries resulting from a fall costs $11,000. - A new therapeutic program can significantly reduce an elderly person''s ...” December 7, 2018 ceilidh.erickson posted a reply to OG 2018 Difficulty level for questions? in the GMAT Math forum “GMAC has not published difficulty levels for any of the OGs up to OG 2018. Prep companies can only take our best guesses at the difficulty levels, based on the performances of our students. Manhattan Prep has a tool called Navigator that allows students to record their answers to every OG ...” December 7, 2018 Brent@GMATPrepNow posted a reply to Circle question help in the Problem Solving forum “We''ll begin by arbitrarily placing point A somewhere on the circumference. https://i.imgur.com/hRHtq4o.png So, we want to know the probability that a randomly-placed point B will yield a chord AB that is at least 2 cm long. So, let''s first find a location for point B that creates a chord ...” December 7, 2018 Brent@GMATPrepNow posted a reply to Let C be defined as the sum of all prime numbers between in the Problem Solving forum “C = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 = 129 So, C/3 = 129/3 = 43 Answer: E Cheers, Brent” December 7, 2018 Brent@GMATPrepNow posted a reply to 2k years ago Frank was 3k years old. In k years Frank's age, in the Problem Solving forum “These kinds of questions (Variables in the Answer Choices - VIACs) can be answered algebraically or using the input-output approach. Mitch has solved the question using the input-output approach, so let''s use the algebraic approach. 2k years ago Frank was 3k years old. We''re given Frank''s ...” December 7, 2018 Max@Math Revolution posted a new topic called Which of the following equations is satisfied by x=1+√2? in the Problem Solving forum “[Math Revolution GMAT math practice question] Which of the following equations is satisfied by x=1+√2? A. x^2 – 2x - 1 = 0 B. x^2 – 2x + 1 = 0 C. x^2 + 2x - 1 = 0 D. x^2 + 2x + 1 = 0 E. x^2 – x - 2 = 0” December 7, 2018 Max@Math Revolution posted a reply to A triangle is formed by connecting three randomly chosen ver in the Problem Solving forum “=> Since the hexagon has 6 vertices, and we need to choose 3 of them to form the vertices of the triangle, the total number of triangles that can be formed is 6C3 = 20. Note that only the following 2 triangles do not include an edge of the hexagon: https://i.postimg.cc/GHpkvPNg/12-7.png ...” December 7, 2018 Max@Math Revolution posted a new topic called Is x > y? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] Is x > y? 1) x+y > 2 2) x^2 < 2y” December 7, 2018 Max@Math Revolution posted a reply to x is a positive number. What is the median of x, √x and x^ in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” December 7, 2018 Rich.C@EMPOWERgmat.com posted a reply to During a special promotion, a certain filling station is off in the Problem Solving forum “Hi All, We''re told that during a special promotion, a certain filling station is offering a 10 percent discount on gas purchased AFTER the first 10 gallons. Kim purchased 20 gallons of gas, and Isabella purchased 25 gallons of gas. We''re asked for Isabella''s total PER-GALLON DISCOUNT as a ...” December 7, 2018 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 ...” December 6, 2018 Brent@GMATPrepNow posted a reply to If all of the telephone extensions in a certain company must in the Problem Solving forum “NOTE: Always SCAN the answer choices before performing any calculations. Here, we notice that the answer choices are pretty small, so if we don''t come up a full solution, we should consider LISTING AND COUNTING We get the following extensions: 1236 1326 1362 1632 2136 2316 3126 3162 ...” December 6, 2018 Brent@GMATPrepNow posted a reply to If all of the telephone extensions in a certain company must in the Problem Solving forum “Take the task of arranging the 4 digits and break it into stages. We’ll begin with the most restrictive stage. Stage 1: Select the digit in the units position Since the 4-digit extension must be EVEN, the unit digit must be either 2 or 6 So, we can complete stage 1 in 2 ways Stage ...” December 6, 2018 Brent@GMATPrepNow posted a reply to What was the revenue that a theater received from the sale in the Data Sufficiency forum “Target question: What was the revenue that a theater received from the sale of 400 tickets Jump straight to . . . Statements 1 and 2 combined The combined statements tell us that 100 tickets sold for the full price of$25 each. The remaining 300 tickets were sold at some reduced price. ...”
December 6, 2018
Brent@GMATPrepNow posted a reply to A certain high school offers two foreign languages, Spanish 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 students, and the two characteristics are: - ...”
December 6, 2018
Brent@GMATPrepNow posted a reply to In year x, it rained on 40% of all Mondays and 20% of all in the Data Sufficiency forum
“In any given year, there will be 52 or 53 Mondays, 52 or 53 Tuesdays, etc. So, it''s impossible to say that it rained on 40% of all Mondays or 20% of all Tuesdays, etc. For example, if there are 52 Mondays, then 40% of 52 = 20.8, which means that it rained on 20.8 days (impossible). Cheers, ...”
December 6, 2018
Max@Math Revolution posted a new topic called Tom saved $10,000 at a constant compound interest rate of r in the Problem Solving forum “[Math Revolution GMAT math practice question] Tom saved$10,000 at a constant compound interest rate of r percent annually. After 10 years, the balance is double the principal. What will be the balance 30 years after the deposit? A. $30,000 B.$40,000 C. $50,000 D.$60,000 ...”
December 6, 2018
Max@Math Revolution posted a reply to How many positive two-digit integers have a remainder of 1 w in the Problem Solving forum
“=> Let x be a positive integer with these properties. Since x = 2p + 1 for some integer p, the possible values of x are x = 1, 3, 5, 7, … . Since x = 3q + 2 some integer q, the possible values of x are x = 2, 5, 8, 11, … . Since x = 5r + 4 for some integer 4, the possible values of x ...”
December 6, 2018
Max@Math Revolution posted a new topic called If a and b are integers, is a-b an even number? in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If a and b are integers, is a-b an even number? 1) a^2b^2 is an even number 2) a^2+2b^2 is an even number”
December 6, 2018
Max@Math Revolution posted a reply to n is a positive integer. Is n divisible by 3? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...”
December 6, 2018
Brent@GMATPrepNow posted a reply to Three men sit at a table. One dollar is placed in front of in the Problem Solving forum
“Let''s see what happens if a man waits until the last (5th) round to take the money. Round #1: $1 placed in front of the man (but he doesn''t take it) Round #2: Now,$2 placed in front of the man (but he doesn''t take it) Round #3: Now, $4 placed in front of the man (but he doesn''t take it) ...” December 5, 2018 Brent@GMATPrepNow posted a reply to If a, b, and c are positive integers such that a < b < in the Data Sufficiency forum “Target question: Is a% of b% of c an integer? This is a great candidate for rephrasing the target question. Aside: We have a free video with tips on rephrasing the target question: a% of b% of c is the same as (a/100)(b/100)(c), which equals abc/10,000 So, we can rephrase the target ...” December 5, 2018 Rich.C@EMPOWERgmat.com posted a reply to 190 students go to a school bake sale. 95 buy a chocolate in the Problem Solving forum “Hi All, We''re told that 190 students go to a school bake sale. Of those students, 95 buy a chocolate chip cookie, 75 buy a peanut butter cookie, and AT LEAST 12 buy both. We''re asked for the LEAST number of students who could have bought NEITHER type of cookie. This question is a variation on ...” December 5, 2018 Rich.C@EMPOWERgmat.com posted a reply to What is the difference between the number of three-member in the Problem Solving forum “Hi All, To start, I agree with Brent; the wording of this prompt is ''clunky'' - and the GMAT writers word their questions in a far more rigorous and specific fashion than what we see here. That having been said, the basic concepts involved here are Combinations and Permutations. We''re ...” December 5, 2018 Rich.C@EMPOWERgmat.com posted a reply to Mr. McCall selects a number that is two-digit and positive. in the Problem Solving forum “Hi All, We''re told that Mr. McCall selects a number that is two-digit and positive: If the number is prime, then he assigns that many problems for homework. If the number is NOT prime, then he assigns 8 MORE problems than the number for homework. We''re told he assigns 97 problems for homework. ...” December 5, 2018 Brent@GMATPrepNow posted a reply to If w, x, and y are consecutive odd positive integers and w & in the Problem Solving forum “Here''s a 3rd approach: GIVEN: w, x, and y are consecutive odd positive integers and w < x < y Since consecutive odd integers go up by 2, we can write: x = w + 2, and y = w + 2 + 2 = w + 4 So, y - x - w = (w + 4) - (w + 2) - w = w + 4 - w - 2 - w = 2 - w Since w is an ODD integer, ...” December 5, 2018 Brent@GMATPrepNow posted a reply to What is the difference between the number of three-member in the Problem Solving forum “The number of three-member committees that can be formed from a group of nine members Since the order in which we select the 3 people does not matter, we can use combinations. We can choose 3 people from 9 people in 9C3 ways 9C3 = (9)(8)(7)/(3)(2)(1) = 84 three-member committees The total ...” December 5, 2018 Brent@GMATPrepNow posted a reply to All the 7 books of the fictional character series Horry in the Problem Solving forum “At$8 per book, the 8 books SHOULD have cost $64 (8 x$8 = $64) However, Harry bought the 8 books for$60 So, the amount Harry saved = $64 -$60 = $4 What is savings percentage for Harry, who bought the whole set together? Percent savings = 100(amount saved)/(original price) = 100(4)/64 = ...” December 5, 2018 Max@Math Revolution posted a new topic called A triangle is formed by connecting three randomly chosen ver in the Problem Solving forum “[Math Revolution GMAT math practice question] A triangle is formed by connecting three randomly chosen vertices of a hexagon. What is the probability that at least one of the sides of the triangle is also a side of the hexagon? A. 4/5 B. 5/6 C. 7/8 D. 8/9 E. ...” December 5, 2018 Max@Math Revolution posted a reply to If n is a positive integer, which of the following could be in the Problem Solving forum “=> Recall that x^3 – y^3 = (x-y)(x^2+xy+y^2).’ Now, (n+1)^3 - n^3 = ( n + 1 – n ) ( (n+1)^2 + (n+1)n + n^2 ) = (n+1)^2 + (n+1)n + n2 = n^2 + 2n + 1 + n^2 + n + n2 = 3n^2 + 3n + 1 = 3n(n+1) + 1 Thus (n+1)^3 - n^3 has remainder 1 when it is divided by 3. 631 is the only answer ...” December 5, 2018 Max@Math Revolution posted a new topic called x is a positive number. What is the median of x, √x and x^2? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] x is a positive number. What is the median of x, √x and x^2? 1) x^2=x 2) x^2+x+1=3x” December 5, 2018 Max@Math Revolution posted a reply to Is x + 1/x > 2? in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. The first ...” December 5, 2018 Max@Math Revolution posted a new topic called [Math Revolution] Practice “Math Questions of the Day” in the GMAT Math forum “To help you sharpen your math skills and hit your target score of Q49-51, we are sending you 4 math questions (2 DS, 2 PS) and solutions regularly. These questions are the types of questions appearing in GMAT exam frequently. Please Click the link for solutions. ...” December 5, 2018 Rich.C@EMPOWERgmat.com posted a reply to If s and t are two different numbers on the number line, is in the Data Sufficiency forum “Hi All, We''re told that S and T are two DIFFERENT numbers on the number line. We''re asked if S + T = 0. This is a YES/NO question and can be solved by TESTing VALUES and a bit of Number Property logic. 1) The distance between S and 0 is the SAME as the distance between T and 0 Since S ...” December 4, 2018 Rich.C@EMPOWERgmat.com posted a reply to In a certain company, 25% of the women and 17% of the men in the Data Sufficiency forum “Hi All, This question involves some subtle Number Property rules that you have to consider to get the correct answer. Those rules, along with TESTing VALUES, can help you to quickly answer the question... We''re told that 25% of the women and 17% of the men participate in the voluntary equity ...” December 4, 2018 Rich.C@EMPOWERgmat.com posted a reply to In her position as a real estate agent, Sarah receives a bon in the Problem Solving forum “Hi All, We''re told that Sarah receives a bonus for EACH sale she makes - and that last week, she earned a$4,000 bonus, which decreased her AVERAGE bonus amount to $4800 (which represents a decrease of 4%). We''re asked for the number of sales Sarah made. This question can be solved in a couple ...” December 4, 2018 Brent@GMATPrepNow posted a reply to Charlie takes 2.5 hours to fly from Los Angeles to Mexico Ci in the Problem Solving forum “Average speed = (total distance traveled)/(total travel time) So, Average speed = 1200/2.5 = 2400/5 = 4800/10 = 480 mph Answer: D Cheers, Brent” December 4, 2018 Brent@GMATPrepNow posted a reply to In her position as a real estate agent, Sarah receives a bon in the Problem Solving forum “Last week, Sarah earned a$4,000 bonus, which decreased her average bonus amount to $4800. This represents a decrease of 4%. Let x = OLD average bonus amount We can write: x - 0.04x =$4800 Simplify: 0.96x = $4800 Solve: x =$4800/(0.96) = $5000 How many sales has Sarah made? Let n = the ...” December 4, 2018 Max@Math Revolution posted a new topic called How many positive two-digit integers have a remainder of 1 w in the Problem Solving forum “[Math Revolution GMAT math practice question] How many positive two-digit integers have a remainder of 1 when divided by 2, a remainder of 2 when divided by 3, and a remainder of 4 when divided by 5? A. 1 B. 2 C. 3 D. 4 E. 5” December 4, 2018 Max@Math Revolution posted a new topic called n is a positive integer. Is n divisible by 3? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] n is a positive integer. Is n divisible by 3? 1) 36/n is divisible by 3 2) 27/n is divisible by 3” December 4, 2018 Rich.C@EMPOWERgmat.com posted a reply to If x^3 < x^2, what is the value of the integer x? in the Data Sufficiency forum “Hi All, We''re told that X is an INTEGER and X^3 is LESS than X^2. We''re asked for the value of X. This question can be solved with a mix of Number Properties and TESTing VALUES. To start, there are only certain types of values that will fit the given information that X^3 is less than X^2: ...” December 3, 2018 Rich.C@EMPOWERgmat.com posted a reply to A certain company that sells only cars and trucks reported in the Problem Solving forum “Hi All, We''re told that a certain company that sells only cars and trucks reported that revenues from car sales in 1997 were down 11 percent from 1996 and revenues from truck sales in 1997 were up 7 percent from 1996. If total revenues from car sales and trucks sales in 1997 were up 1 percent ...” December 3, 2018 Rich.C@EMPOWERgmat.com posted a reply to Mary is building a pyramid out of stacked rows of soup cans. in the Problem Solving forum “Hi All, We''re told that Mary is building a pyramid out of stacked rows of soup cans; the top row of the pyramid contains a single soup can, each row below the top row contains 6 MORE cans than the one above it and the completed pyramid contains 16 rows. We''re asked for the TOTAL number of soup ...” December 3, 2018 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 another 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 ...” December 3, 2018 Max@Math Revolution posted a new topic called If n is a positive integer, which of the following could be in the Problem Solving forum “[Math Revolution GMAT math practice question] If n is a positive integer, which of the following could be the value of (n+1)^3 - n^3? A. 629 B. 630 C. 631 D. 632 E. 633” December 3, 2018 Max@Math Revolution posted a new topic called Is x + 1/x > 2? in the Data Sufficiency forum “[Math Revolution GMAT math practice question] Is x + 1/x > 2? 1) x > 0 2) x ≠ 1” December 3, 2018 Max@Math Revolution posted a reply to If x^2=x+1, then x^4=? in the Problem Solving forum “=> x^4 = (x^2)^2 = (x+1)^2 = x^2 + 2x + 1 = (x + 1) + 2x + 1 = 3x + 2. Therefore, the answer is A. Answer: A” December 3, 2018 Max@Math Revolution posted a reply to The equation of a circle in the x-y coordinate plane is x^2 in the Problem Solving forum “=> We need to find all pairs of integers (a,b) such that a^2 + b^2 = 25. These are: (5,0), (4,3), (3,4), (0,5), (-3,4), (-4,3), (-5,0), (-4,-3), (-3,-4), (0,-5), (3,-4) and (4,-3). Thus, there are 12 such points that lie on the circle. Therefore, the answer is E. Answer: E” December 3, 2018 Max@Math Revolution posted a reply to If k is a positive integer and n=(k-1)k(k+1), is n a multipl in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we ...” December 3, 2018 Max@Math Revolution posted a reply to If m and n are positive integers, what is the greatest commo in the Data Sufficiency forum “=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since two ...” December 3, 2018 ceilidh.erickson posted a reply to Most of Western music since the Renaissance has been based in the Critical Reasoning forum “For more on using this strategy for BOLDFACE questions on CR, see: https://www.beatthegmat.com/gmat-official-guide-2019-in-countries-where-automobile-t303686.html#818265 https://www.beatthegmat.com/gmat-official-guide-2019-boreal-owls-range-over-a-much-t303663.html#818059 ...” December 2, 2018 ceilidh.erickson posted a reply to Most of Western music since the Renaissance has been based 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 - support for the author - the counterpoint / what others believe - support for the counterpoint - neutral / background information / establishing ...” December 2, 2018 ceilidh.erickson posted a reply to 3 Month Study Plan? in the GMAT Strategy forum “You have more than enough material to study! Here''s what you need to do: Here''s what you should do: 1. Take an adaptive Practice Exam (CAT). If you bought the Mprep books, you''ll have access to our entire suite of practice exams. Don''t prep first - just dive in and take the test, ...” December 2, 2018 ceilidh.erickson posted a reply to Help me Beat the GMAT in the I just Beat The GMAT! forum “You can''t find what went wrong? You just told us what went wrong - you over-studied! Being well-rested is absolutely critical for brain functioning (see the studies that say that being sleep-deprived made people perform worse on driving tests than being drunk). There''s nothing that you could ...” December 2, 2018 ceilidh.erickson posted a reply to A certain bookstore, each notepad costs x dollars and each in the Data Sufficiency forum “Translate the given information:$10 is enough to buy 5 notepads and 3 markers --> $$5x+3y\le10$$ Translate the question: is $10 enough to buy 4 notepads and 4 markers instead? --> $$4x+4y\le10\ ?$$ Simplify: $$2x+2y\le5\ ?$$ 1) Each notepad cost less than$1. If x < 1, ...”
December 2, 2018
ceilidh.erickson posted a reply to Several friends in a dinner group decide to contribute in the Data Sufficiency forum
“For similar variations on this type of word problem, see: https://www.beatthegmat.com/impossible-question-ps-203-t281881.html#739205 https://www.beatthegmat.com/dollars-t273184.html#707179 ...”
December 2, 2018
ceilidh.erickson posted a reply to Several friends in a dinner group decide to contribute in the Data Sufficiency forum
“Here, we have a version of a rate problem: ($contribution per person)(# of people) = total$ amount contributed From the question stem, we''re given that the total amount contributed is $36. Let: c =$ contribution per person n = number of people (c)(n) = 36 Since the question is asking ...”
December 1, 2018
ceilidh.erickson posted a reply to the minimum number of straight lines required to in the GMAT Math forum
“This is not a GMAT-style question. The GMAT does not ask for this style of time-consuming puzzle problem. Please still to questions only from GMAC or reputable test prep companies.”
December 1, 2018
Rich.C@EMPOWERgmat.com posted a reply to When running a mile during a recent track meet, Nuria was in the Problem Solving forum
“Hi All, We''re told that when running a mile during a recent track meet, Nuria was initially credited with a final time of 5 minutes, 44 seconds. Shortly after her run, officials realized that the timing mechanism malfunctioned. The stopwatch did not begin timing her until 11/25 of a MINUTE ...”
December 1, 2018
Rich.C@EMPOWERgmat.com posted a reply to When a certain tree was first planted, it was 4 feet tall in the Problem Solving forum
“Hi All, TESTing the ANSWERS is a great way to tackle this question. The "fast" way to solve a problem can still sometimes take time, but regardless of how you approach a prompt, you still need to take notes and stay organized. From the screen capture, you chose answer C (1/2). If ...”
December 1, 2018
Rich.C@EMPOWERgmat.com posted a reply to Portia purchased a laptop for $480, but after checking the in the Problem Solving forum “Hi All, We''re told that Portia purchased a laptop for$480, but after checking the merchant''s website realized that she had been overcharged by 20%. We''re asked how many dollars she was overcharged. This question can be solved in a couple of different ways, including by TESTing THE ANSWERS. ...”
December 1, 2018
Brent@GMATPrepNow posted a reply to For each of her sales, a saleswoman receives a commission in the Problem Solving forum
“Saleswoman receives a commission equal to 20 percent of the first $500 of the total amount of the sale, plus 30 percent of the total amount in excess of$500 If she sold $800, then... Commission = (20 percent of$500) + (30 percent of $300) =$100 + $90 =$190 The saleswoman''s commission ...”
December 1, 2018
Brent@GMATPrepNow posted a reply to Portia purchased a laptop for $480, but after checking the in the Problem Solving forum “Let x = the INTENDED price of the laptop Portia was overcharged by 20% So, x + (20% of x) = the amount Portia paid In other words: x + 0.2x =$480 Simplify: 1.2x = 480 Solve: x = 480/1.2 = 400 So, Portia was SUPPOSED to pay $400, but she actually paid$480 So, Portia was overcharged ...”
December 1, 2018
Brent@GMATPrepNow posted a reply to When a certain tree was first planted, it was 4 feet tall in the Problem Solving forum
“Height of tree on day 0 = 4 Let d = the height increase each year Height of tree at the end of the 1st year = 4+d Height of tree at the end of the 2nd year = 4+d+d = 4 + 2d Height of tree at the end of the 3rd year = 4+d+d+d = 4 + 3d Height of tree at the end of the 4th year = 4+d+d+d+d = 4 + ...”
December 1, 2018
Rich.C@EMPOWERgmat.com posted a reply to Reggie purchased a car costing $8,700. As a down payment he in the Problem Solving forum “Hi All, We''re told that Reggie purchased a car costing$8,700 and as a down payment he used a $2,300 insurance settlement and an amount from his savings equal to 15 percent of the difference between the cost of the car and the insurance settlement. He borrowed the rest of the money needed to ...” November 30, 2018 Rich.C@EMPOWERgmat.com posted a reply to Of the employees at a company, 60 percent were men and, of in the Problem Solving forum “Hi swerve, We''re told that of the employees at a company, 60 percent were men and, of these, 1/10 were still employed after a recent corporate restructuring and the number of women who were still employed after the restructuring was FIVE TIMES the number of men who were employed after it. ...” November 30, 2018 Brent@GMATPrepNow posted a reply to Last Friday a certain shop sold 3/4 of the sweaters in its in the Data Sufficiency forum “ Given: Last Friday a certain shop sold 3/4 of the sweaters in its inventory. Each sweater sold for$20. Target question: What was the total revenue last Friday from the sale of this sweaters? Statement 1: When the shop opened last Friday, there were 160 sweaters in its inventory. 3/4 ...”
November 30, 2018
Brent@GMATPrepNow posted a reply to When running a mile during a recent track meet, Nuria was in the Problem Solving forum
“The long approach is to meticulously convert 11/25 of a minute to seconds, and then ADD that unaccounted time to Nuria''s recorded time (of 5 minutes, 44 seconds) However, when we check the answer choices before performing any calculations (ALWAYS check the answer choices before performing any ...”
November 30, 2018
Max@Math Revolution posted a new topic called If x^2=x+1, then x^4=? in the Problem Solving forum
“[Math Revolution GMAT math practice question] If x^2=x+1, then x^4=? A. 3x+2 B. 3x-2 C. 2x+3 D. 2x-3 E. 3x+4”
November 30, 2018
Max@Math Revolution posted a reply to A club has 10 members. One president and two vice-presidents in the Problem Solving forum
“=> The number of ways to choose one president out of 10 people is 10C1 = 10. The number of ways to choose two vice-presidents out of the remaining 9 people is 9C2 = (9*8)/(1*2) = 36. Thus, the number of ways to choose one president and two vice-presidents out of 10 people is 10 * 36 = 360. ...”
November 30, 2018
Max@Math Revolution posted a new topic called If k is a positive integer and n=(k-1)k(k+1), is n a multipl in the Data Sufficiency forum
“[Math Revolution GMAT math practice question] If k is a positive integer and n=(k-1)k(k+1), is n a multiple of 8? 1) k is an odd number 2) k = 1”
November 30, 2018
Max@Math Revolution posted a reply to If n is a positive integer, is √17n an integer? in the Data Sufficiency forum
“=> Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Modifying ...”
November 30, 2018
Rich.C@EMPOWERgmat.com posted a reply to A box contains red and blue balls only. If there are 8 balls in the Data Sufficiency forum
“Hi All, We''re told that a box contains red and blue balls only and that there are 8 balls in total. We''re asked for the number of RED balls are in the box. 1) If two balls are randomly selected without replacement, the probability that both balls are red is 5/14 To start, since we''re ...”
November 29, 2018
Rich.C@EMPOWERgmat.com posted a reply to Inequality in the Data Sufficiency forum
“Hi All, We''re asked for the value of |X - 2|. This question comes down to a specific math concept (Absolute Value), some basic arithmetic and thoroughness on your part - meaning that you have to make sure that you answer the question that is ASKED. 1) |X - 4| = 2 Since we''re dealing ...”
November 29, 2018
Rich.C@EMPOWERgmat.com posted a reply to 3 Month Study Plan? in the GMAT Strategy forum
“Hi intelligenthuman171, 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 ...”
November 29, 2018
Brent@GMATPrepNow posted a reply to GMAT PREP CR... why is A wrong? in the Critical Reasoning forum
“A student asked me to answer this question, so here it goes . . . 1) Read the question stem to determine the question type. Tricky! With fill-in-the-blank questions, it''s often difficult to determine the question type. The last sentence reads Unitron is not going to hire department heads ...”
November 29, 2018
Brent@GMATPrepNow posted a reply to New cars leave a car factory in a repeating pattern of red, in the Problem Solving forum
“Let''s examine the pattern. CAR # | color 1 | red 2 | blue 3 | black 4 | gray 5 | red 6 | blue 7 | black 8 | gray 9 | red . . . The pattern REPEATS EVERY 4 CARS. So, we say the pattern has CYCLE 4 Also, notice that every car # that''s divisible by 4 is gray So, let''s find a ...”
November 29, 2018
Max@Math Revolution posted a new topic called The equation of a circle in the x-y coordinate plane is x^2 in the Problem Solving forum
“[Math Revolution GMAT math practice question] The equation of a circle in the x-y coordinate plane is x^2+y^2=25. How many points of the form (a,b), where a and b are integers, lie on this circle? A. 4 B. 6 C. 8 D. 10 E. 12”
November 29, 2018
Max@Math Revolution posted a reply to If 1+2+2^2+... +2^n=2^{n+1}-1, what is the largest prime fac in the Problem Solving forum
“=> 1+2+2^2+... +2^7 = 2^8 – 1 = (2^4+1)(2^4-1) = (2^4+1)(2^2+1)(2^2-1) = (2^4+1)(2^2+1)(2+1)(2-1) = 17*5*3. 17 is the largest prime factor of 1+2+2^2+... +2^7. Therefore, D is the answer. Answer: D ”
November 29, 2018