# shashi001gitam

“As usual, the goal appears to be responding as quickly as possible, to maintain the "most responsive" grade, regardless of accuracy. Sigh... -t”
September 30, 2014
Tommy Wallach posted a reply to is parallelogram a type of trapezoid? in the GMAT Math forum
“Ha! Jim always gives the worst answers. Cracks me up. -t”
August 29, 2014
Tommy Wallach posted a reply to Information Booth--support question! in the Critical Reasoning forum
“Hey Duong, Your assumption should not doubt the premise. Your assumption here is just questioning the premise. Accept the premise as fact, then look for a gap between that FACT and the conclusion. -t”
March 15, 2013
Anurag@Gurome posted a reply to GMAT PREP PS question in the Problem Solving forum
“Because the question said "... the store packs the notepads in packages that contain either 3 notepads of the same size and the same color or 3 notepads of the same size and of 3 different colors" Those are two different scenarios. For each of them, 8 different packages are possible. ...”
March 13, 2013
Anurag@Gurome posted a reply to Word Problem - Ages question in the Problem Solving forum
“These are not two approaches, these are calculating the maximum age of the child Jane could have baby-sit at two different points in the time, i.e. when she started baby-sitting and stopped it. Obviously the greater of the two will be the potential correct answer. A proper mathematical ...”
March 8, 2013
Anurag@Gurome posted a reply to how to solve absolute values and absolute value inequalities in the GMAT Math forum
“You''re not doing anything wrong except that redundancy part. But before remembering this hard and fast "rules" and "shortcuts", I''ll suggest you to tackle these problems logically. Once you practice to do so there won''t be any rules to remember. The practical implication ...”
March 8, 2013
Anurag@Gurome posted a reply to Arithmetic Properties of Number in the Data Sufficiency forum
“I''m assuming this is the problem you are talking about... Statement 1: As v and z can have values either 1 or 2 or 3, for (v + z) to be equal to 6, v and z both must be equal to 3. Now, as v is present second row and second column, no other member of second row and second column can have ...”
March 8, 2013
Anurag@Gurome posted a reply to how to solve absolute values and absolute value inequalities in the GMAT Math forum
“That''s what you already did in 2.a. 2.a ---> (y + 14) = -2 <---- Multiply both sides by -1 --> -y - 14 = 2 <--- 2.b 2.b is completely redundant as it is a different version of 2.a By definition of |x|, |x| = x if x ≥ 0 and |x| = -x if x < 0 Hence, here if (y + 14) ≥ 0, ...”
March 8, 2013
Anurag@Gurome posted a reply to Real Numbers - Arithematic in the Problem Solving forum
“The expression will not be real only if the expression under root is negative. So, (-2(x+1) - (x-2)) < 0 --> 2(x + 1) + (x - 2) > 0 --> 3x > 0 --> x > 0 Only possible answer is x = 0.5 The correct answer is E.”
March 8, 2013
Anurag@Gurome posted a reply to Evenly Divisible ?? in the Data Sufficiency forum
“In simple words, "evenly divisible" means ''divisible''. Statement 1: 2R is divisible by 3. As 2 is not a multiple of 3, R must be a multiple of 3. Sufficient Statement 2: 3R is divisible by 3. As 3 is a multiple of 3, R may or may not be a multiple of 3. Not sufficient ...”
March 8, 2013
Anurag@Gurome posted a reply to optimization in the Problem Solving forum
“No. The reverse is not true. To illustrate with a simple example, take xy = 4 ---> (4 + 1) > (2 + 2)”
March 7, 2013
Anurag@Gurome posted a reply to optimization in the Problem Solving forum
“Algebraic Method: (x + y)² = (x² + y² + 2xy) = (100 + 2xy) ---> (x + y) = √(100 + 2xy) To maximize (x + y), we need to maximize xy which we will do by maximizing x²y². Now, remember this rule if you don''t know it yet, Given the sum of two numbers, their product will be maximum when ...”
March 7, 2013
Anurag@Gurome posted a reply to optimization in the Problem Solving forum
“x² + y² = 100 Hence, 0 ≤ x ≤ 10 and 0≤ y ≤ 10 Some obvious possible values for x and y are {x = 10, y = 0} or {x = 6, y = 8} In first case, (x + y) = 10 ---> Discard option 1 In second case, (x + y) = 14 ---> Discard option 2 Now, 7² = 49 ---> 7² + 7² = 98 is just less ...”
March 7, 2013
Anurag@Gurome posted a reply to Population Ratio in the Data Sufficiency forum
“Let us take an example question like "The population of a town is 6,250,000. If the ratio of number of males to number of females in the town is 14:11, how many male are there in the town? Also, what percentage of the population are female?" Ratio of male to female is 14:11 Hence, in ...”
March 7, 2013
Anurag@Gurome posted a reply to Population Ratio in the Data Sufficiency forum
“I''m afraid you don''t remember the numbers properly. Because the total population (6,754,000) is not a multiple of (14 + 9) = 23. Hence, the number of males and females will not be integer which is impossible.”
March 7, 2013
Anurag@Gurome posted a reply to Remainders in the Problem Solving forum
“No, that is correct. But the question asks "...which of the following could NOT be a possible value of M + N?" And as Mitch has shown, (M + N) will be 4 more than a multiple of 6. Hence, the correct option should NOT yield a multiple of 6 when 4 is subtracted from it. As 10 yields a ...”
March 7, 2013
Anurag@Gurome posted a reply to Factors of 24 in the Problem Solving forum
“The possible values of x and y are : 1, 2, 3, 4, 6, 8, 12, and 24 also x ≠ y Option I This is a perfect square. The only factors of 24 that are perfect squares are 1 and 4. If (x + y)² is equal to 1 or 4, then (x + y) = 1 or (x + y) = 2 There is no way, x and y can have values from the ...”
March 7, 2013
Anurag@Gurome posted a reply to Gmat question help! in the Problem Solving forum
“Thank you for pointing out that we can approximate the actual answer to select the best answer. I''ve modified my reply accordingly. However, I believe in GMAT if you come across such a question they will either include the exact answer in the options or ask to find out the approximate ratio. ...”
March 7, 2013
Anurag@Gurome posted a reply to Double set matrix problem in the Problem Solving forum
“Here is a method that someone will find easier than the matrix method. Let us assume there are 100 students in the school. Hence, 60 of them love roller coasters. Now, (100 - 20)% = 80% of these 60 students do not own chinchillas. 80% of 60 = 80*60/100 = 48 Hence, 48% of students love ...”
March 7, 2013
Anurag@Gurome posted a reply to Double set matrix problem in the Problem Solving forum
“Yes, it is 80% of 60, i.e. 80% of the students who love roller coasters. But the question asks you to find out the same in terms of total students which is 48%. Hope that helps.”
March 7, 2013
Anurag@Gurome posted a reply to Gmat question help (part two) in the Problem Solving forum
“These questions are not very much clear to me. In fact I feel the data provided is not complete because they can be interpreted in different ways. For example, in the first question it is mentioned that "... the trends for year 1 to year 2 continue to year 3...", which type of trend we ...”
March 7, 2013
Anurag@Gurome posted a reply to Algebra in the Problem Solving forum
“Let us assume n = 100 Hence, there is 40 ounce of vermouth and 60 ounce of gin. We have to make the ratio of vermouth to gin 25:75 by adding say x ounce of gin. So, 40/(60 + x) = 25/75 = 1/3 --> 60 + x = 3*40 = 120 --> x = 120 - 60 = 60 = (60/100)*100 = (3/5)*100 = (3/5)*n The ...”
March 7, 2013
Anurag@Gurome posted a reply to Gmat question help! in the Problem Solving forum
“Question Number 18: Let us assume, the sales for single glazing and double glazing in December of previous year was S and D, respectively. Hence, sales of single glazing in January = S - 20% of S =(0.80)*S = 40,000 ---> S = 40,000/0.8 And, sales of double glazing in January = D + 40% of D ...”
March 6, 2013
Anurag@Gurome posted a reply to Gmat question help! in the Problem Solving forum
“Question Number 17: Refer to the following table for the total sales in January, February, and April. http://s11.postimage.org/o69i52hr7/btg.jpg Hence, required ratio = (285 + 290)/230 = 575/230 = 5/2 The correct answer is E.”
March 6, 2013
Anurag@Gurome posted a reply to Gmat question help! in the Problem Solving forum
“Question Number 16: If the sales for the month of June follows the same trend as for April to May, the sales of single glazing, triple glazing, and wood embedded will increase by 5000 and the sales for double glazing and UPVC glazing will decrease by 10000. Hence, the difference in total sales ...”
March 6, 2013
Anurag@Gurome posted a reply to DS-Co-ordinate Geometry in the Data Sufficiency forum
“Refer to the post here >> http://www.beatthegmat.com/og-13-ds-q-129-t117128.html#491613”
March 6, 2013
Anurag@Gurome posted a reply to Reminders in the Problem Solving forum
“A/B = 4.35 ---> A = (4.35)*B = 4B + (0.35)*B Hence, when A is divided by B, the remainder is (0.35)*B = 35B/100 = 7B/20 = 7*(B/20) Hence, the remainder must be a multiple of 7. The correct answer is B.”
March 6, 2013
Anurag@Gurome posted a reply to probability in the Problem Solving forum
“I guess this is a DS problem posted in wrong forum. Anyway, the required probability = (Number of refined numbers in first 1000 positive integers)/1000 Hence, we need to know what is refined number and how many of them are in the first 1000 positive integers. Statement 1: This is not a ...”
March 6, 2013
Anurag@Gurome posted a reply to ALEBRA in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/gmat-ques-pls-help-t104479.html#449216”
March 6, 2013
Anurag@Gurome posted a reply to Remainders in the Problem Solving forum
“Are you trying to say 10 is multiple of 6?”
March 6, 2013
Anurag@Gurome posted a reply to OG - Q.137 in the Problem Solving forum
“As stated by Abhishek this equation is good enough for those who are fairly good at algebra. If someone feels it is a bit difficult to factorize the expression, here is a trick... --> (x² + 4x - 672) = 0 --> (x² + 4x + 4) - 676 = 0 --> (x + 2)² = 676 = 26² --> (x + 2) = ±26 ...”
March 6, 2013
Anurag@Gurome posted a reply to integrated reasoning question in the Problem Solving forum
“Because 3 is exactly 50% of 6.”
March 6, 2013
Anurag@Gurome posted a reply to What is value of x? in the Problem Solving forum
“Refer the following posts... http://www.beatthegmat.com/2-x-2-x-2-3-2-13-what-is-x-t178975.html#577790 http://www.beatthegmat.com/2-x-2-x-2-3-2-13-what-is-x-t178975.html#577789”
March 6, 2013
Anurag@Gurome posted a reply to Divisibility Quant Review (#169) in the Problem Solving forum
“Picking Number Approach: Least possible value of n² such that n² is divisible by 72 is 72*2 = 144 Hence, minimum possible value of n = 12. Largest possible integer that divides n is 12. Algebraic Approach: n² is divisible by 72 Hence we can write n² as 72k, where k is an positive ...”
March 6, 2013
Anurag@Gurome posted a reply to Quant Review- Divisibility in the Problem Solving forum
“n = 5*a + 1. n = 7*b + 3. Here, a and b are integers. Note that the difference between divider and remainder (5 - 1 and 7 - 3) is 4 in both the case. So add 4 on both sides of each of the 2 equations. So, we get n + 4 = 5*a + 5 = 5*(a + 1). n+4 = 7*b + 7 = 7*(b + 1). This means n+4 is a ...”
March 6, 2013
Anurag@Gurome posted a reply to OG - Q.137 in the Problem Solving forum
“Algebraic Approach: Let us assume that the regular hourly rate = R, and the estimated time = T Then RT = 336 ... Equation (1) Also, (R - 2)(T + 4) = 336 ... Equation (2) From Equations (1) and (2), RT = (R - 2)(T + 4) Solving we get, RT = RT - 2T + 4R - 8 T = 2R - 4 Now we can plug in ...”
March 6, 2013
Anurag@Gurome posted a reply to Probability problem in the Problem Solving forum
“Probability of missing at least one test = Probability of missing test in only one day + Probability of missing test on both the day Probability of missing test in only one day = (Probability of happening test on one of the day he was absent)*(Probability of not happening test on the other day he ...”
March 5, 2013
Anurag@Gurome posted a reply to Question on Algebra in Data Sufficiency in the Data Sufficiency forum
“Statement 1: Consider the following two cases, x = 0.5 ---> Statement 2: Consider the following two cases, x = -0.5 ---> 1 & 2 Together: Now, we know that x is greater than -1 but less than 0. Hence, the least integer greater than or equal to x will always be equal to 0. Sufficient ...”
March 5, 2013
Anurag@Gurome posted a reply to Bacteria Quadruples in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/problem3-t152589.html#543949”
March 5, 2013
Anurag@Gurome posted a reply to Basketball wins in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/problem9-t152956.html#544527”
March 5, 2013
Anurag@Gurome posted a reply to Time and work related in the Problem Solving forum
“The money will be distributed on the basis of how much they have contributed, i.e. what fraction of the work they have done NOT on the basis of their work efficiency, i.e. how much work they could''ve done. Hence, their daily wage will be (fraction of work they do in one day)*(total money) ...”
March 5, 2013
Anurag@Gurome posted a reply to Question regarding Manhattan Word Problems Book in the GMAT Math forum
“Selections and arrangements are different things. When you have to arrange something, first you have to select them. For example, say there are 5 people but 3 chairs. In how many ways the 5 people can sit on the 3 chairs? First we have to select 3 people from 5 people ---> Selection In ...”
March 5, 2013
Anurag@Gurome posted a reply to INTEGERS in the Problem Solving forum
“That doesn''t make any sense. Please check your source and post the actual question.”
March 5, 2013
Anurag@Gurome posted a reply to 343. Mark is playing poker at a casino. Mark starts playing in the Problem Solving forum
“Initially Mark had (0.2*140) = 28 chips of $100 and (140 - 28) = 112 chips of$20 Let us assume Mark placed N chips for the first bet. Hence, he placed N/10 chips of $100 for the first bet. Now, 30% of remaining chips = 3(140 - N)/10 chips are of$100. So, N/10 + 3(140 - N)/10 = 28 --> N + ...”
March 5, 2013
Anurag@Gurome posted a reply to probability question in the Problem Solving forum
“For each person who is both agent and clerk, we have two agents and one clerk. Hence, among (1 + 2 + 1) = 4 people there is only one person who is both agent and clerk. Required probability = 1/4 The correct answer is C.”
March 5, 2013
Anurag@Gurome posted a reply to Does xy=x2 (the 2 is the exponent) in the Data Sufficiency forum
“Statement 1: y² - xy = 0 ---> y(x - y) = 0 Now either y = 0 or x = y For y = 0, xy may not be equal to x² For x = y, xy is always equal to x² Not sufficient Statement 2: x² - 2xy + y² = 0 ---> (x - y)² = 0 ---> x = y Hence, xy is always equal to x² Sufficient The ...”
March 5, 2013
Anurag@Gurome posted a reply to Nova Book in the Problem Solving forum
“The method provided in the book is short and simple enough. You can try for 1 - C2 = 6 Number of ways to select 2 numbers from the set such that there sum is 5 --> {1 and 4} or {2 and 3} = 2 Hence, required probability = 2/6 = 1/3 The correct answer is B.”
March 4, 2013
Anurag@Gurome posted a reply to Is n-1>0? in the Data Sufficiency forum
“Statement 1: n² - n > 0 ---> n(n - 1) > 0 This means either n and (n - 1) are of same sign. Hence, it is possible that, Both are positive ---> (n - 1) > 0 Both are negative ---> (n - 1) < 0 Not sufficient Statement 2: n² = 9 --> n = ±3 Not sufficient 1 & ...”
March 4, 2013
Anurag@Gurome posted a reply to Unknown Digits in the Problem Solving forum
“Algebraic Solution: AB = (10A + B) CD = (10C + D) AAA = (100A + 10A + A) So, (10A + B) + (10C + D) = (100A + 10A + A) --> 10C + B + D = 100A + A --> C = The correct answer is D.”
March 4, 2013
Anurag@Gurome posted a reply to Unknown Digits in the Problem Solving forum
“Maximum possible value of the sum of 2 two-digit number is (99 + 99) = 198 In this case the sum is of the form AAA, i.e. a three-digit number whose all the three digits are same. Only possible sum is 111. This means A = 1 Now we can approach for finding C in two ways, Method #1 As A = 1, AB ...”
March 4, 2013
Anurag@Gurome posted a reply to Ratio or Not in the Problem Solving forum
“Plugging options: Note that the concentration (35%) of the final solution is closer to 40% solution than the 25% solution. Hence, amount of 25% solution in the final solution must be less than 1/2. This means C, D, or E cannot be the answer. Now, plug the options A and B. Option A: 25*(1/4) ...”
March 4, 2013
Anurag@Gurome posted a reply to Ratio or Not in the Problem Solving forum
“Algebraic Solution: Say, the fraction is x. Hence, x parts of the final solution is 25% solution and (1 - x) part is 40% solution. So, 25x + 40(1 - x) = 35 --> 15x = 40 - 35 = 5 --> x = 5/15 = 1/3 The correct answer is B.”
March 4, 2013
Anurag@Gurome posted a reply to Ugly Multiplication in the Problem Solving forum
“I can''t think of any easy way to do this except approximating the multiplications in each step as follows, 9/10 = 0.9 2 --> (0.9)*(0.9) = 0.81 3 --> (0.81)*(0.9) ≈ 0.73 4 --> (0.73)*(0.9) ≈ 0.65 5 --> (0.65)*(0.9) ≈ 0.59 6 --> (0.59)*(0.9) ≈ 0.53 7 --> ...”
March 4, 2013
Anurag@Gurome posted a reply to Probability 9 competitors in triathlon in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/probability-triplets-t112908.html#475030”
March 4, 2013
Anurag@Gurome posted a reply to OG DS-Algebra Question in the Data Sufficiency forum
“it is given that 2^2n. You cannot just change the base to -2. Statement 1: This means the product of two consecutive integers n and (n + 1) is 6. One obvious such pair is 2 and 3, i.e. n = 2. But -2, and -3, i.e. n = -3 is also another possibility. Not sufficient Statement 2: 16 can be ...”
March 4, 2013
Anurag@Gurome posted a reply to Grockit - Coordinate Geometry Q in the Data Sufficiency forum
“In coordinate geometry, reflection over or with respect to a line means as if there is a invisible mirror placed on the line. For example, in the following figure P'' is the reflection of P with respect to the line l, meaning as if there is an invisible mirror along the line l on which P'' is the ...”
March 4, 2013
Anurag@Gurome posted a reply to Mgmat CAT PS question in the Problem Solving forum
“Here is the explanation for official answer... Let assume the ages of Joan, Kylie, Lillian, and Miriam are J, K, L, and M, respectively. Hence, J = (K - 2), K = (L + 3), M = (J + 1) Expressing them all with respect to L only, K = (L + 3), J = (L + 1), and M = (L + 2) Hence, combined age of ...”
March 4, 2013
Anurag@Gurome posted a reply to Need help with this Manhattan Number properties guide Q in the Problem Solving forum
“Yes, you can do that. But that trick is helpful only when the number of times "the event doesn''t happen" is smaller than the number of times "the event happens". In this case, that trick will complicate your calculation as not choosing one white and one blue doesn''t mean ...”
March 4, 2013
Anurag@Gurome posted a reply to If 375y=x^2 and z and y are positive integers.... in the Problem Solving forum
“375 = 3*125 = 3*5*(5²) Hence, to make 375y a perfect square y must contain at least one 3 and one 5, i.e. y must be a multiple of 15. Hence, only 1 and 2 must be an integer. The correct answer is C. It is not necessary to find out the value of x. However, to clear your doubts, as I''ve ...”
March 4, 2013
Tommy Wallach posted a reply to Kaplan Percentile Meaning in the GMAT Strategy forum
“Hey There, Surprisingly, 50-60% is the normal range of correct answers for all scores between about 500-650, so that''s not too weird. -t”
March 3, 2013
Anurag@Gurome posted a reply to Mixture/ratio problem 4 in the Problem Solving forum
“In 14 liters of drink A, amount of milk = (4/7)*14 = 8 liter Let us assume that, we need to add x liters of fruit juice. Hence, total amount of drink = (14 + x) As we haven''t add any milk, amount of milk is 8 liter So, 8/(14 + x) = 3/7 --> 3(14 + x) = 56 --> 3x = 56 - 42 --> x = ...”
March 3, 2013
Anurag@Gurome posted a reply to AMixture/ratio problem 3 in the Problem Solving forum
“20% of the bottle = 70 ml Hence, 80% of the bottle = 4*70 ml Now, amount of guava juice in the bottle = 60% of 80% of the bottle = 60% of 4*70 ml = 60*4*70/100 = 6*4*7 = 168 The correct answer is B.”
March 3, 2013
Anurag@Gurome posted a reply to DS Percent of females in the Data Sufficiency forum
“As neither the question nor the statements tell us anything about the percentage of males, there is a chance that both statements together also will not be sufficient. Let us check that scenario first with some numbers. Example 1: P = F = I = 100 --> Total = 300 Total number of female = 40% ...”
March 3, 2013
Anurag@Gurome posted a reply to Question on Average salary in the Data Sufficiency forum
“Let us assume the annual salaries of Mary, Jim, and Kate are M, J, and K, respectively. Hence, M is greater than J and K. Hence, (M - J) = 2(M - K) ---> M + J = 2K Hence, average salary = (M + J + K)/3 = (2 K+ K)/3 = K Hence, we need to find K. Clearly, statement 2 is sufficient bu ...”
March 3, 2013
Anurag@Gurome posted a reply to Number line in the Data Sufficiency forum
“Statement 1: This means C is the midpoint of AB, AC = BC = 9 Hence, possible scenarios are... A--D---C-----B --> In this case BD = BC + CD = 9 + 8 = 17 A-----C---D--B --> In this case BD = BC - CD = 9 - 8 = 1 Not sufficient Statement 2: Not enough to conclude anything. Not ...”
March 3, 2013
Anurag@Gurome posted a reply to DS - Question in the Problem Solving forum
“.. is not an integer." because if √(10d) is an integer, then it is not possible for √d to be an integer which is contradictory to statement 1. I am replying assuming the correction. Otherwise, if the question is considered as posted, both statements will be sufficient to answer the ...”
March 3, 2013
Anurag@Gurome posted a reply to product of integers in the Data Sufficiency forum
“Product of first 8 positive integers = 1*2*3*4*5*6*7*8 = (2*4*2*8)*(3*3*5*7) = (2^7)*(3^2)*(5*7) As a and n are both positive integers greater than 1, only possible values for a and n are either {a = 2 and 2 ≤ n ≤ 7} or {a = 3 and n = 2} or {a = 4 and 2 ≤ n ≤ 3} or {a = 8 and n = 2} ...”
March 3, 2013
Anurag@Gurome posted a reply to Minimum possible population in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/question-from-gmat-prep-help-please-3-t110122.html#464522”
March 3, 2013
Anurag@Gurome posted a reply to Percentage population employed in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/idea-of-overlapping-sets-t112758.html#474556”
March 3, 2013
Anurag@Gurome posted a reply to Inequalities x, y, z in the Problem Solving forum
“The actual questions asks "... which of the following statements can be true?" Refer to the post here >> http://www.beatthegmat.com/if-x-y2-z4-t72017.html#326108”
March 3, 2013
Anurag@Gurome posted a reply to DS: Numbers in the Data Sufficiency forum
“Statement 1: Consider the following two lists... {0, 0, 0} ---> All numbers are equal to zero {0, 0, 1} ---> All numbers are not equal to zero Not sufficient Statement 2: Let us take a general case for three numbers a, b, and c. Hence, (a + b) = 0, (b + c) = 0, and (a + c) = 0 ...”
March 3, 2013
Anurag@Gurome posted a reply to Coffee cup temperature in the Problem Solving forum
“Temperature after t minutes = 120*The correct answer is B”
March 3, 2013
Anurag@Gurome posted a reply to Of 1400 college teachers surveyed in the Data Sufficiency forum
“Let us assume number of women teacher surveyed was W. Hence, number of men teacher surveyed was (1400 - W) Statement 1: 36% of men + 50% of women = 42% of 1400 Hence, 36*(1400 - W) + 50*W = 42*1400 We can solve W from the above equation. Sufficient Statement 2:As we don''t know the ...”
March 3, 2013
Anurag@Gurome posted a reply to conditional probability in the Problem Solving forum
“Number of outcomes with at least one head = 3 {HH, TH, HT} Number of outcomes with two heads = 1 {HH} Hence, required probability = 1/3 The correct answer is A.”
March 3, 2013
Anurag@Gurome posted a reply to conditional probability 2 in the Problem Solving forum
“We have three positions 1st, 2nd, and 3rd. For each position we have two choices, either boy or girl. But we know that the second position is already filled by a boy. Hence, total number of possibility for filling the positions = (2 choices for 1st position)*(2 choices for 2nd position) = 2*2 = 4 ...”
March 3, 2013
Anurag@Gurome posted a reply to Problem Solving - don't understand missing step in the Problem Solving forum
“Here 3x^2(x-2) means (3x²)*(x - 2), i.e. this is the product of 3x² and (x - 2) And, (-x + 2) = -(x - 2) = (-1)*(x - 2) Hence, the numerator = [(3x²)*(x - 2) - (-1)*(x - 2)] Now, we are taking (x - 2) out of bracket as it is a common factor of both the term, Hence, the numerator = (x - ...”
March 3, 2013
Anurag@Gurome posted a reply to The Department of Environmental Protection measured the vo in the Data Sufficiency forum
“Statement 1: As the new elements are (old element - some constant), the standard deviation won''t change. Sufficient Statement 2: As the new elements are (some constant)*(old element), the new standard deviation will be (same constant)*(old standard deviation) Now, if the old standard ...”
March 2, 2013
Tommy Wallach posted a reply to Archaeologists in Michigan have excavated a Native American in the Critical Reasoning forum
“Hey Duong, There are not two options for solving. On all strengthen/weaken questions, you begin by writing down the conclusion and the premises. Then you look for the gap between them. This is not prediction, by the way. This is simply noticing what''s wrong with the argument (and something is ...”
March 2, 2013
Tommy Wallach posted a reply to iPhones in the Critical Reasoning forum
“Hey Duong, Hm. Not sure I quite agree with your point there. Prediction is a double-edged sword, actually. And while it''s often very strong on assumption questions, it''s not very strong on strengthen/weaken questions. Why? Because S/W questions are allowed to bring in new information, which ...”
March 2, 2013
Tommy Wallach posted a reply to Over the past few years, banks have systematically raised in the Sentence Correction forum
“Hey Aditya, I''d also add that, when all else fails, avoid expletive pronoun forms if you have a better choice. (E) has that expletive form ("it is becoming harder and harder") and (A) doesn''t. Also interesting to note that "one" is also usable as a pronoun. For example, ...”
March 1, 2013
Tommy Wallach posted a reply to Gmat Prep vs. Real Gmat in the GMAT Strategy forum
“Good luck! (Also, FYI, I''ll be abandoning the forum shortly, unfortunately, so if I don''t respond to PM''s and posts, don''t think I''m a jerk!) -t”
March 1, 2013
Anurag@Gurome posted a reply to A museum offers four video programs in the Problem Solving forum
“Refer to the post here >> http://www.beatthegmat.com/really-challenging-word-problems-t115148.html#483757”
March 1, 2013
Anurag@Gurome posted a reply to Tangent problem in the Problem Solving forum
“I think a mathematical explanation will help you to analyze this kind of problems in future than remembering zillions of theorems and formulas. Take the two triangles OAC and OBC OB = OA (As they are radii of the larger circle) angle OCA = angle OCB (As the tangent (AB) is perpendicular to any ...”
March 1, 2013
Tommy Wallach posted a reply to A charitable association sold 66 raffle tickets in the Problem Solving forum
“Hey Gmatdriller, Absolutely right! Well done! -t”
March 1, 2013
Tommy Wallach posted a reply to Gmat Prep vs. Real Gmat in the GMAT Strategy forum
“I cannot blame you for that desire. However, the truth is there is no such test. You will not get loads of questions that you have no way of knowing how to solve. If you can recognize every single error on every single question in the OG, that is definitively enough to score very well on the test. I ...”
February 28, 2013
Tommy Wallach posted a reply to Gmat Prep vs. Real Gmat in the GMAT Strategy forum
“Hey BP, You know I love you, right? Because I''m about to get "real" with you (like they used to do on the Real World): This test is not illegitimate or awful or weird or terrible. The prep materials are not perfect but they''re perfectly adequate to prepare one for scoring well on ...”
February 28, 2013
Tommy Wallach posted a reply to mixture problem - rabbit & proteins in the Problem Solving forum
“Hey Anastasios, There are two great ways to do it. Either as algebra, or a weighted average: Algebra: X + Y = 300 (because that''s total mixture) .1X + .15Y = 38 (because that''s the protein) Then, multiply both sides of the second equation by 10: X + 1.5Y = 380 X + Y = ...”
February 28, 2013
Tommy Wallach posted a reply to Policymakers in the Sentence Correction forum
“Hey All, Hope that helps! -t”
February 28, 2013
Tommy Wallach posted a reply to 2 Questions in the GMAT Integrated Reasoning forum
“Hey Guys, You both seem to be missing the symbols above the circles. Remember, two overlapping sets require four locations: People in only group 1, People in only group 2, People in both, People in neither. If you count all these, you''ll find 30 things. Question #1: The Symbols up top ...”
February 28, 2013
Tommy Wallach posted a reply to Icelandic in the Sentence Correction forum
“Hey Sid, The way you''re thinking about this is a common error made by people preparing for the GMAT. Do not try to memorize some infinite list of strange little idiomatic forms. Instead, utilize POE to cross answers off that have more glaring errors. Do I love (D)? Not at all. Is it ...”
February 28, 2013
Anurag@Gurome posted a reply to Sequences - DS in the Data Sufficiency forum
“No mathematics is needed here if you understand that "any term after S₂ is sum of the two terms Sn-1 and Sn-2" means any terms after S₂ is the sum of the previous two consecutive terms. Hence, if we know the values of S₁ and S₂, we can determine the value of any term after S₂. ...”
February 28, 2013
Anurag@Gurome posted a reply to geometry question in the Problem Solving forum
“In triangle GAF, FG = GA ---> GAF = GFA Now, GAF is nothing but DAE. Hence, GFA = DAE Hope that helps.”
February 28, 2013
Anurag@Gurome posted a reply to beat this if you can! in the Data Sufficiency forum
“I''d disagree here. There will be infinite parallelograms in the universe (with angles 45, 45, 135, 135) that has an area of 100. Without going into mathematical details, one can visualize that once we get one such parallelogram we can slightly "squeeze" it to change the length of the ...”
February 28, 2013
Anurag@Gurome posted a reply to Mixture/ratio problem . in the Problem Solving forum
“Amount of copper in the 20 kg bar of alloy = 5*20/(5 + 11) = 100/16 = 25/4 kg Let us assume that the weight of the first bar was x kg. Hence, weight of the 2nd bar was (20 - x) kg. Amount of copper in the x kg bar of alloy = 2*x/(2 + 5) = 2x/7 kg Amount of copper in the (20 - x) kg bar of alloy ...”
February 28, 2013
Anurag@Gurome posted a reply to If x and y are positive, is x < 10 < y in the Data Sufficiency forum
“Hope that helps.”
February 28, 2013
Anurag@Gurome posted a reply to If x and y are positive, is x < 10 < y in the Data Sufficiency forum
“Point to note : x and y are positive. hence, we can multiply or divide any inequality with either x or y without bothering about the inequality sign. Statement 1: x < y ---> x² < xy ---> x² < 100 ---> x < 10 Similarly, y > x ---> y² > xy ---> y² > 100 ...”
February 28, 2013
Anurag@Gurome posted a reply to probability question in the Problem Solving forum
“Total number of ways to select a group of 5 member from 9 candidates = 9C5 = 126 Required probability = 1 - C1)*(4C4)/126 = 5/126 Probability that the group attending the workshop will have exactly 2 students = (5C2)*(4C3)/126 = 10*4/126 = 40/126 Hence, required probability = 1 - (5/126 + ...”
February 28, 2013
Anurag@Gurome posted a reply to Really tough probability question in the Problem Solving forum
“Another method for solving this problem... Total number of ways to select the president, secretary and treasurer without any constraint = (10C1)*(9C1)*(8C1) = 10*9*8 Number of ways to select the president, secretary and treasurer such Harry is either Secretary or Treasurer = C1)*(1C1)*(8C1) + ...”
February 28, 2013
Anurag@Gurome posted a reply to Really tough probability question in the Problem Solving forum
“Required probability = 1 - [Probability that Harry is selected for president or Harry is not selected at all] Probability that Harry is selected for president = 1/10 Probability that Harry is not selected at all = (9/10)*(8/9)*(7/8) = 7/10 Hence, equired probability = 1 - [1/10 + 7/10] = 1 - ...”
February 28, 2013
Anurag@Gurome posted a reply to range in the Problem Solving forum
“Conceptually yes, but not in the format it has been posted.”
February 28, 2013
Anurag@Gurome posted a reply to range in the Problem Solving forum
“Let us assume the a is the smallest number and b is the largest number. Hence, b = (a + 2) Now let us consider the two extreme cases, When all the intermediate numbers are equal to the smallest sum = (9a + b) = (10a + 2) --> a = (28 - 2)/10 = 2.6 --> b = 4.6 When all the intermediate ...”
February 28, 2013
Tommy Wallach posted a reply to A charitable association sold 66 raffle tickets in the Problem Solving forum
“Hey Vipul, Do you see how your answer doesn''t even make sense? If the average is 66 but the women got 70, which is higher than 66, then we need something lower from the men, to balance it out. If the women got 70 and the men got 78, the overall average would be somewhere between 70 and 78. -t ...”
February 28, 2013
Anurag@Gurome posted a reply to Tough one - Math experts pls help for smart solution? in the Problem Solving forum
“This problem has been solved quite a number of times in this forum. Refer to the post here >> http://www.beatthegmat.com/coordinate-plane-t77573.html#345142”
February 28, 2013
Tommy Wallach posted a reply to 6 Key Takeaways from the GMAT Test Prep Summit 2013 in the GMAT Strategy forum
“Yes, my understanding is that leaving questions blank (i.e. with the old strategy of devoting more time to the front) is a bad strategy at any reasonable test score level, and so it would be irresponsible to give any advice other than "Don''t leave questions blank." -t”
February 28, 2013
Tommy Wallach posted a reply to Comparison in the Sentence Correction forum
“A lot of great discussion here, but I know folks like the final executive order: Hope that helps!”
February 28, 2013
Tommy Wallach posted a reply to Hello alligator, after while crocodile in the Sentence Correction forum
“Hey Jain, Absolutely right. The unlike makes them dissimilar, so it doesn''t make sense to then try to compare levels. -t”
February 28, 2013
Tommy Wallach posted a reply to Function in the Data Sufficiency forum
“Hey Guys, Yep. Ignore questions like this. (It only has four answer choices!). -t”
February 28, 2013
Tommy Wallach posted a reply to Doubt Clarification: in the Critical Reasoning forum
“I think you''re thinking of it backwards. If there are fewer fishermen, there would be more salmon! -t”
February 28, 2013
Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum
“At 730? Just keep doing what you''re doing! Seriously, just review your practice tests, and don''t get rusty. You''re already in the zone! -t”
February 27, 2013
Anurag@Gurome posted a reply to Number Properties in the Data Sufficiency forum
“The question asked whether k has a factor p such that 1 < p < k NOT whether k has all the factors p such that 1 < p < k. This means if there is at least one such p, the answer will be yes. Hence, if k = 13! + 3 = 1*2*3*4*...*12*13 + 3 = 3*(1*2*4*...*12*13 + 1) = Multiple of 3 Hence, ...”
February 27, 2013
Tommy Wallach posted a reply to A charitable association sold 66 raffle tickets in the Problem Solving forum
“Hey Piyush, That''s definitely not right, but I''m afraid I can''t even follow the logic. If you want to explain where each step comes from, that might help. First thing is I''m not sure where you''re getting 77. Did you mean 70? If so, try redoing your math with that... -t”
February 27, 2013
Anurag@Gurome posted a reply to geometry question in the Problem Solving forum
February 27, 2013
Tommy Wallach posted a reply to Reporting that one of its many problems had been the in the Sentence Correction forum
“Hey Aditya, Yeah, that''s a tough one. I personally prefer the present perfect, because the implication of the sentence is that the action of the slump does continue into the present (they said they would start a liquidation, meaning they haven''t yet). So I believe both tenses are justifiable, ...”
February 27, 2013
Anurag@Gurome posted a reply to Tangent problem in the Problem Solving forum
“Algebraic Solution: Triangle OCB is a right-angled triangle with angle OCB = 90 degrees Hence, OC² + CB² = OB² --> r² + 6² = R² --> R² - r² = 36 --> (R - r)(R + r) = 36 As both r and R are positive integers, (R - r) and (R + r) must be integers too with (r + r) > (R - ...”
February 27, 2013
Anurag@Gurome posted a reply to Tangent problem in the Problem Solving forum
“Tricky Solution: Refer to the figure below http://s14.postimage.org/c1apyq6st/btg.jpg Say, radius of the inner circle = OC = r and radius of the larger circle = OB = R And, AC = CB = AB/2 = 6 Now, triangle OCB is a right-angled triangle with angle OCB = 90 degrees Hence, OC, CB, and CB ...”
February 27, 2013
Tommy Wallach posted a reply to Reporting that one of its many problems had been the in the Sentence Correction forum
“Hey Aditya, Fair enough. Always worth remembering that there are plenty of official question that have a weird sound to them. Indeed, the only real issues here are the singular pronoun its (matching up with retailer), and the past perfect verb (because we need to go back in time BEFORE the ...”
February 27, 2013
Tommy Wallach posted a reply to Misc3 in the Sentence Correction forum
February 27, 2013
Anurag@Gurome posted a reply to Help in the Data Sufficiency forum
“1. The first red line is redundant, as from the given equation itself we can deduce that x³ = x². 2. x = 1 as well as x = 0 both satisfy the equation.”
February 27, 2013
Anurag@Gurome posted a reply to ARITHMETIC - PROPERTIES OF NUMBERS in the Data Sufficiency forum
February 27, 2013
Anurag@Gurome posted a reply to help in the Data Sufficiency forum
“You can also check with picking some numbers. Consider the following two cases, p = 1, q = 1, s = 1, t = 2 --> Greatest = t p = -1, q = 1, s = 0, t = 0 ---> Greatest = q”
February 27, 2013
Anurag@Gurome posted a reply to help in the Data Sufficiency forum
“Yes, you are correct about the positive-negative scenario but decimal-fraction has nothing to do here. Both statements together: As average of q and r is s, s must be between q and r. And as sum of q and r is t, t must be smaller than both q and r, if both q and r are negative t must be greater ...”
February 27, 2013
Anurag@Gurome posted a reply to Help in the Data Sufficiency forum
“Statement 1: x³ - x² = 0 --> x²(x - 1) = 0 Hence, either x² = 0 or (x - 1) = 0 Hence, either x = 0 or x = 1 As we cannot uniquely determine the value of x, statement 1 alone is not sufficient Statement 2: (-x)² = -x² As (-x)² cannot be negative and -x² cannot be positive, the ...”
February 27, 2013
Tommy Wallach posted a reply to Reporting that one of its many problems had been the in the Sentence Correction forum
“What is the source of this aditya? -t”
February 27, 2013
Tommy Wallach posted a reply to Misc3 in the Sentence Correction forum
“Hey Sana, Again, "to" is not being used for intention here. It''s an idiom, much like: He is thought to be a great man. He is known to be a great golfer. He admits to being a terrible person. -t”
February 27, 2013
Anurag@Gurome posted a reply to number propeties in the Problem Solving forum
“Number of multiples of 3 between -100 and 100 = (Number of multiples of 3 between -1 and -100 + Number of multiples of 3 between -1 and -100) + 1 (for zero) Now, number of multiples of 3 between 1 and 100 = Number of multiples of 3 between -1 and -100 Number of multiples of 3 between 1 and 100 ...”
February 27, 2013
Anurag@Gurome posted a reply to greatest common factor in the Problem Solving forum
“GCF of 16 and n is 4 ---> n is multiple of 2 and 4 but not of 8 or 16 GCF of 45 and n is 3 ---> n is multiple of 2 but not of 5 or 9 Hence, n = 2*2*3*(Something) And, 210 = 2*3*5*7 Hence, we know for sure that GCF of 210 and n will be a multiple of both 2 and 3 but not of 4 or 5. But ...”
February 27, 2013
Tommy Wallach posted a reply to Misc3 in the Sentence Correction forum
“Hey Aditya, No, this is a separate idiom: "grounds to". So it isn''t about intent. -t”
February 27, 2013
Tommy Wallach posted a reply to Lyme disease is caused by a bacterium transmitted to humans in the Critical Reasoning forum
“Believe it or not, I actually have a problem with this argument as written. If answer choice (B) is true, then the ticks numbers are limited by food sources. Okay. Great. So now we increase the numbers of all the other creatures they could feed on. This would cause the number of deer ticks to ...”
February 27, 2013
Tommy Wallach posted a reply to Press in the Critical Reasoning forum
“Hey Guys, As Charu says, this is an LSAT question. And as Aditya is correctly pointing out, LSAT questions do not accurately simulate the GMAT. You would think that because Logical Reasoning and Critical Reasoning are so similar, there wouldn''t be a problem, but there is. It''s actually right ...”
February 27, 2013
Tommy Wallach posted a reply to A charitable association sold 66 raffle tickets in the Problem Solving forum
“Hey Gmatdriller, This is a weighted average question. You can use the concept of weights/residuals to solve it without any annoying equation. 66 is the balance point around which everything must even out. The women sold an average of 70 tickets each. That''s four more than 66, but because ...”
February 27, 2013
Tommy Wallach posted a reply to unresponsive admisson's office... in the GMAT Strategy forum
“Hey DCS, Your scores are due by the general application due date. Official score reports are available to programs 20 days after you take the test. So you would want to have taken your test 20 days before the official due date at the schools in question. Generally a little more just to be safe. ...”
February 27, 2013
Tommy Wallach posted a reply to Doubt Clarification: in the Critical Reasoning forum
“Hey Chitturi, That''s some tricky thinking on your part! The good news is that the GMAT will very seldom be that tricky. They could play some game talking about "90% of the world''s waters froze," in which case you wouldn''t know if the rivers in question were in the 90% or the 10%. But ...”
February 27, 2013
“Hey Independent, I think your strategy sounds great. The only thing I''m unsure about is the CR Bible. Why not just use the OG books to practice CR? (The truth is I don''t know much about the CR Bible, so I get nervous). Otherwise, I like your approach. One day of quant and one day of verbal is ...”
February 27, 2013
Tommy Wallach posted a reply to Misc3 in the Sentence Correction forum
“Hey Manu, Thanks for that. I know the official answer is (C), but my understanding of idioms is that both (B) and (C) are justifiable, so I don''t think this is realistic. These are adequate grounds for divorce. He said these are grounds to initiate a separation. Both of those sentences ...”
February 27, 2013
Tommy Wallach posted a reply to Can anybody help me with this question? in the Sentence Correction forum
“Hey Sahil, That''s the worst question I''ve ever read. Ignore it. But just for fun: (A) "who" is modifying selection, which is wrong. (B) "it dampened" is a pronoun error. What did the dampening? (C) "came the dampener" is gibberish, also there''s no second half ...”
February 27, 2013
Tommy Wallach posted a reply to Misc3 in the Sentence Correction forum
“Hey Manu, Agreed. Oftentimes people want to put up just a few answer choices, none of which are correct, to try to get a sense of which is "best". This is not a good idea. I don''t personally like either of these examples: Both "grounds to" and "grounds for" are ...”
February 27, 2013
Tommy Wallach posted a reply to OG13 in the Sentence Correction forum
“Hey Duong, Think of it this way: (D) scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than the emergence which was previously thought First off, it''s an incorrect modifier "which" (requires a comma). But beyond that, the logic here ...”
February 27, 2013
Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum
“Everything you said there is spot on, Mo. I''m sure your practice test will go swimmingly. : ) -t”
February 27, 2013
Tommy Wallach posted a reply to like vs as, true vs untrue in the Sentence Correction forum
“Hey Duong, Not sure where you''re getting that explanation. "Move" is a verb and "that" is a relative pronoun. "Do" is also a verb. All relative pronouns modify the word directly before them, and "that" can''t modify a verb. In this case, "that" ...”
February 26, 2013
Anurag@Gurome posted a reply to DS_Quest in the Data Sufficiency forum
“Whenever problems with two sets (Say A and B) are involved always remember there are four scenarios - only A, only B, both and none. Now, A = only A + both B = only B + both Hence, Either A or B = A + B - both Total = Either A or B + None = A + B - Both + None For example, int his case a ...”
February 26, 2013
Anurag@Gurome posted a reply to Co-ordinate Geometry in the Data Sufficiency forum
“To determine the coordinates of the midpoint of a line segment, we need to know the coordinates of both the endpoints of the segment. Hence, none od the statements are individually sufficient. Let''s check whether together they are sufficient or not. 1 & 2 Together: x-coordinate of the ...”
February 26, 2013
Anurag@Gurome posted a reply to Remainder in the Data Sufficiency forum
“Hi Hemant! Although you have achieved the "correct answer" that too using the proper algebraic method, I''d chip in to point out a mistake which may be a silly mistake or a basic misconception. If a positive integer n leaves a remainder of 13 when divided by 25, n will either of the ...”
February 26, 2013
Anurag@Gurome posted a reply to Remainder in the Data Sufficiency forum
“n will be of the form (25m + 13), where m is some non-negative integer. Hence, possible values of n are 13, 38, 63, 88, 113, 138, 163 ... etc Statement 1: n can be 13 or 38 or 63 or 88 ---> Not sufficient Statement 2: n is also of the form (20n + 3), where n is some non-negative integer. ...”
February 26, 2013
Anurag@Gurome posted a reply to Number Properties in the Data Sufficiency forum
“Refer to the post here >> http://www.beatthegmat.com/integers-problem-t70990.html#320994”
February 26, 2013
Anurag@Gurome posted a reply to Babies born in the Data Sufficiency forum
“Yes, your reasoning is correct. However, this can solved without analyzing the statements as well. We know that x = (Number of single births) + (Number of double births) Now, number of double births will be always even. Hence, x = EVEN + Something If that something is even, x will be even ...”
February 26, 2013
Anurag@Gurome posted a reply to EQUATIONS + AVERAGE in the Data Sufficiency forum
“Let us assume, he bough W pairs of woolen socks and C pairs of cotton socks. And price of each pair of woolen socks and cotton socks are $n and$(n - 3), respectively. Hence, average price of a pairs of socks = Statement 1: C = 3W Hence, average price = Statement 2: (n - 3)C = 2nW Hence, ...”
February 26, 2013
Anurag@Gurome posted a reply to Inequalities in the Data Sufficiency forum
“Statement 1: xy > 0, x and y are of same sign zy > 0, z and y are of same sign Hence, x, y, and z are all of same sign. As we know nothing about the sign of either x or y, we can''t say whether z < 0 or not. Not sufficient Statement 2: We don''t know what is the relation between ...”
February 26, 2013
Anurag@Gurome posted a reply to absolute value in the Data Sufficiency forum
“y = |x + 3| + |4 - x| means y is the sum of the distances of x from -3 and 4 on the number line. Now the distance between -3 and 4 on the number line is (3 + 4) = 7. Hence, the sum of the distances of x from -3 and 4 on the number line will be equal to 7 only if x lies between -3 and 4. If it is ...”
February 26, 2013
Anurag@Gurome posted a reply to SOLVING EQUATIONS in the Data Sufficiency forum
“It is not given. The question asked whether (x + y) = 7 or not. You are taking that as supplied information, and putting back into the question. You can''t do that. Statement 1: Consider the following two examples, x = 0, y = 8 ---> (x + y) ≠ 7 x = 3, y = 4 ---> (x + y) = 7 Not ...”
February 26, 2013
Anurag@Gurome posted a reply to Ratios, Cola, Root Beer and Ginger in the Data Sufficiency forum
“When there are n unknowns, you need n independent equations to uniquely solve any of them (provided there is no constraints). Hence, if you go by this logic you''ll make a mistake to think that you need three equations to solve three unknowns because here we have a constraint, which is all the ...”
February 26, 2013
Anurag@Gurome posted a reply to ALGEBRA in the Data Sufficiency forum
“(k + m)² = k² + m² + 2km Hence, km = The correct answer is A.”
February 26, 2013
Anurag@Gurome posted a reply to Need help with this Manhattan Number properties guide Q in the Problem Solving forum
“Number of ways to select 2 marbles out of 10 marbles = 10C2 = 45 Number of ways to select one white and one blue marble = (Number of ways to select 1 white marble out of 2)*(Number of ways to select 1 blue marble out of 5) = 2*5 = 10 Hence, required probability = 10/45 = 2/9”
February 26, 2013
Tommy Wallach posted a reply to Tense Confusion in the Sentence Correction forum
“Hey Guys, Sorry, but the GMAT wouldn''t do this. There isn''t enough of a difference between C and E. There''s no need to set up tense order here, because the two things actually happen simultaneously (plants and food are eaten, and the plants grind up the food). I don''t see a strong enough case ...”
February 26, 2013
Tommy Wallach posted a reply to Misc2 in the Sentence Correction forum
“Yes, it''s a parallel issue. "Did" is actually a different verb (to do), where in the first half we only have "grant". It''s also in the simple past tense, where had granted is in the past perfect tense. We could probably get away with the first issue, not definitely not the ...”
February 26, 2013
Tommy Wallach posted a reply to like vs as, true vs untrue in the Sentence Correction forum
“Hey Guys, All the correct explanations have been given here, but there is also some misinformation, so I thought I''d finish it off for you. Also, please try to post questions with full grammatical correctness (i.e. please read over what you wrote and edit it if there are errors). Also, it really ...”
February 25, 2013
Tommy Wallach posted a reply to SC question-Last week local shrimpers held a news conference in the Sentence Correction forum
“Hey Guys, I''ll weigh in on this one: (A) Subject-verb agreement: "compliance" doesn''t match with "protect". Also "requiring that turtle-excluder devices be on shrimp nets" is highly awkward. Would prefer something without the "be". (B) CORRECT! ...”
February 25, 2013
Tommy Wallach posted a reply to Being in the Sentence Correction forum
“Hey Manu, This issue isn''t so much grammatical as style. However: 1) Any usage of the noun form of being, such as "human being" is always okay. 2) The gerund form at the beginning of sentences is almost certainly okay, though I haven''t seen it: "Being in love isn''t always ...”
February 25, 2013
Tommy Wallach posted a reply to George Santayana' work (reminiscent of vs resembles) in the Sentence Correction forum
“Hey Guys, Looks like this has pretty much been parsed, but just to finish it off: (A) George Santanaya might be reminiscent of Plato, but not of Plato''s narratives. (B) George might write like Plato, but not like Plato''s narratives (which don''t write themselves!) (C) George might ...”
February 25, 2013
Tommy Wallach posted a reply to how to start preperation for verbal section? in the Sentence Correction forum
“Hey Maxmanish, You are not alone. The question you are asking has been asked dozens of times here on the forums. So, as a beginning to the hard work you have in front of you, I would encourage you to search through the forum for answers to this question. It''ll get you acquainted with the various ...”
February 25, 2013
Anurag@Gurome posted a reply to Rate of decrease in the Data Sufficiency forum
“Statement 1: Say, mortality rate in 1972 is m Hence, mortality rate in 1976 is (0.9^4)*m Hence, percentage decrease = Statement 2: This is not enough to determine the required percentage as we do not know what happened to the mortality rate in the particular period 1972 to 1976 Not ...”
February 25, 2013
Anurag@Gurome posted a reply to Microchip price decline in the Problem Solving forum
“67% = 67/100 ≈ 2/3 Hence, every 6 months the price becomes (1 - 2/3) = 1/3 of the previous price. As 81 = 3^4, it''ll take 4 six months for the price to reach $1. 4 six months = 2 years The correct answer is B.” February 25, 2013 Tommy Wallach posted a reply to Per a recent survey carried out in Rambo City, in the Critical Reasoning forum “Nah, B''s no good either. I mean, what are the ramifications of bankruptcy, really? The conclusion doesn''t argue that it''s a financially responsible thing to do, only that most people would do it if offered it. Weird one. I say again. -t” February 25, 2013 Tommy Wallach posted a reply to Per a recent survey carried out in Rambo City, in the Critical Reasoning forum “Hey Aditya, Looks like your question got answered. I would argue this isn''t a very well-written question, as neither of those answer choices do enough. You''re right that the "some" in answer choice (A) is problematic, and (C) is bad for the reasons you/David cite. Definitely a weird ...” February 25, 2013 Tommy Wallach posted a reply to 700+ Line congestion in the Critical Reasoning forum “Mo is absolutely right. And just to be clear, answer choice (E) doesn''t tell us much we don''t already know: "The manager reasons that, since the wait times at the entrance will be reduced from about thirty minutes to ten minutes..." So we already know that we have enough attendants ...” February 25, 2013 Tommy Wallach posted a reply to iPhones in the Critical Reasoning forum “This question is gibberish. Answer choice (E) conflicts with the actual argument: "Sales of iphones have increased dramatically over the last year." (E) ...sales of Apple phones have fallen in the past year." Maybe this question is trying to act as if there could be both ...” February 25, 2013 Tommy Wallach posted a reply to GRE vs GMAT? in the The Application Process forum “It''s definitely a good score; the only question is whether it''s on track for the schools you want to apply to. I don''t know enough about their averages, etc to say. GMAT benchmarks are well documented, but the GRE benchmarks are more mysterious... -t” February 24, 2013 Tommy Wallach posted a reply to GRE vs GMAT? in the The Application Process forum “Hey Jjack, A 1350 GRE score wouldn''t be competitive at Top level B-Schools). I don''t know the profile of every single on on your list. The average GMAT there is about a 700, and you''re averaging more like a 660. Beyond that, the quant section on the GRE is quite easy, so they''ll expect that ...” February 24, 2013 Tommy Wallach posted a reply to GMAT prep- Olympic Training in the Sentence Correction forum “Hey Kanha, Unfortunately, most people on here don''t underline, so you have to work it out for yourself (using answer choice A). However, in case anyone''s reading, please do underlined if you can. The option is just above the text box; select the part you want to underline and click it. ...” February 24, 2013 Tommy Wallach posted a reply to GMAT Verbal Review 2nd Edition in the Sentence Correction forum “Hey Mo, The book is decidedly NOT made up of 10th edition questions. Many of the questions are original to that book. Plus, no one is using the 10th edition anymore, and some of the questions might even be considered obsolete, so even if it were true that the V-guide is made up of those, it would ...” February 24, 2013 Tommy Wallach posted a reply to Remainders in the Problem Solving forum “And no imaginary numbers, either! -t” February 24, 2013 Tommy Wallach posted a reply to Please rate my essay... thank you :-) in the GMAT Essays (AWA) forum “Hey Duong, Great first example, paragraph. I think your second is slightly weaker, on two levels: First of all, centralizing would cut costs almost by definition, so it''s weird to act like that isn''t assured. More importantly, I don''t quite see how it''s possible that centralizing would allow ...” February 24, 2013 Tommy Wallach posted a reply to Quant help in the GMAT Strategy forum “That is some good advice from Shenoy right there! -t” February 24, 2013 Tommy Wallach posted a reply to 720 as a Military Officer . . . Retake? in the I just Beat The GMAT! forum “Hey AbhiJ, I can''t speak exactly to the issue of being from an Asian country, but it doesn''t sound like it applies in this case. And even if it did, I''ve never heard of a school making a big deal about a 720 versus a 740, or something like that. At that score level, it comes down to things ...” February 24, 2013 Tommy Wallach posted a reply to Q19-OG 13th CR in the Critical Reasoning forum “I would just remind everyone that the rule is you''re picking the "best" answer, not the "perfect" answer. So don''t stress so much about whether the answer requires an assumption or not, but if there''s an answer choice that doesn''t require an assumption. If there isn''t, then ...” February 24, 2013 Tommy Wallach posted a reply to Cezanne's art inspired the next generation of artists, in the Critical Reasoning forum “Hey Aditya, Mitch is absolutely right here. The first sentence isn''t ascribed to anyone in particular, so we more or less have to take it as fact. That''s enough right there to get to answer choice (C), which is good, because the other stuff seems slightly more contentious (though again, we ...” February 24, 2013 Tommy Wallach posted a reply to GRANT Research Institute publication in the Critical Reasoning forum “Hey Guys, This seems like a pretty weird question, but (E) does win. Conclusion: Legalizing dullnic will not hurt revenues of illegal drug folks Premise: Sales of dullnic within Fruitland are small amount of sales (A) seems plausible. GRANT concludes that even if the legal replaces the ...” February 24, 2013 Tommy Wallach posted a reply to is a 700+ really that important? in the I just Beat The GMAT! forum “Hey Ramms, The answer you''ve already got here is great, but I know it''s always nice to get that expert opinion in there. Indeed, a 650 is good for anything but a top 10 B-school (where the average is around 720). Of course, the easiest way to put all fears to bed is to call up your admissions ...” February 24, 2013 Tommy Wallach posted a reply to what is hardest part of IR in the GMAT Integrated Reasoning forum “Hey All, There is one MSR "passage," with 3 accompanying questions. The other 9 questions are divided pretty evenly between the other three presentation types (two part, drop down, graphs). Most people do find the MSR the most difficult, because there''s so much information and you ...” February 24, 2013 Tommy Wallach posted a reply to Kitchen magazine in the Critical Reasoning forum “Hey Aditya, "Makes of cookware" is indeed "makers of cookware in general". If they wanted to specify, they would have to do that specially, for example: "Makers of this cookware" or "The manufacturers of the Kitchen magazine-endorsed cookware," etc. Make ...” February 24, 2013 Anurag@Gurome posted a reply to Zero is a even integer in the Problem Solving forum “0 is multiple of every integer.” February 23, 2013 Anurag@Gurome posted a reply to Circle intersecting triangle in the Problem Solving forum “See the following figures: http://s2.postimage.org/1h4h7etgk/Circle_and_triangle.jpg Hence, correct answer is E.” February 23, 2013 Anurag@Gurome posted a reply to average in the Problem Solving forum “I couldn''t understand what you mean by "odd series of number". But if you are talking about a series of number in which number of terms is odd, then NO. For example, {1, 2, 9}. In this set median = 2 but mean = (1 + 2 + 9)/3 = 12/3 = 4 When all the elements of a set are ...” February 23, 2013 Tommy Wallach posted a reply to Archaeologists in Michigan have excavated a Native American in the Critical Reasoning forum “Hey Aditya, All I can say is that it''s the best answer out there. If it''s an official question, you just have to accept it. If it''s not, you could argue that it isn''t super well written, but there''s no better case that I can make. We have some evidence that after the 1620s, camps should have ...” February 23, 2013 Tommy Wallach posted a reply to Archaeologists in Michigan have excavated a Native American in the Critical Reasoning forum “Hey Aditya, It''s not your understanding of the phrase that''s wrong, but your understanding of how it affects the argument. Conclusion: Camp is from 1630 at the latest. Evidence: Must be 1605 to 1755, but it doesn''t have stuff from the 1620s in it. That''s the argument as it starts. The ...” February 23, 2013 Tommy Wallach posted a reply to Two decades after the Dead Sea Barrier was built, in the Critical Reasoning forum “Glad to help! -t” February 23, 2013 Tommy Wallach posted a reply to Please rate my essay... thank you :-) in the GMAT Essays (AWA) forum “Hey Jaga, While there''s some good writing in here, overall this essay has a lot of problems. A quick note before I start, the prompt itself is FULL of grammatical issues. I don''t know if you just copied it incorrectly, but if this is taken from an actual website/company, I would recommend ...” February 23, 2013 Tommy Wallach posted a reply to Schools in the Sentence Correction forum “Hey Guys, Expert opinion has arrived! (A) Breaks parallelism "to lure" and "that educate". (B) CORRECT. "to lure" and "educate". The word "to" distributes in the parallel structure, much like has/have: "I have gone to the store and ...” February 22, 2013 Tommy Wallach posted a reply to a tale of two cities in the Sentence Correction forum “Hey Sue, As annoying as it is, most people who post questions on here neglect to use the weird HTML code buttons to locate the underlined portion. However, remember you can always use the answer choices to isolate the section that''s meant to be underlined. Then, you can paste it into a document ...” February 22, 2013 Tommy Wallach posted a reply to What to do when you have exhausted material and dont improve in the GMAT Strategy forum “Hey Mary, So, as you may have guessed, I''m not going to be able to tell you anything massively surprising/interesting. But it will be the truth. You''ve already described yourself what your problem was. It wasn''t preparation (your practice tests are generally a pretty good sign of where ...” February 22, 2013 Tommy Wallach posted a reply to Two decades after the Dead Sea Barrier was built, in the Critical Reasoning forum “Hey Aditya, I think you''ve misconstrued what the "still" is modifying in the sentence (Hey, it''s SC meets CR! What fun!). "Still" is modifying "reproducing," implying that they were reproducing adequately before the dam went up. For the sentence to have the ...” February 22, 2013 Tommy Wallach posted a reply to Q19-OG 13th CR in the Critical Reasoning forum “Hey Aditya, Honestly, it isn''t possible/logical for multiple news stations to air the same report. It would be a bit like having a TV network air a new episode of a TV show. Other channels simply can''t post the exact same thing; it isn''t how TV works. Does this require a bit of a working ...” February 22, 2013 Anurag@Gurome posted a reply to Help Functions! in the Problem Solving forum “I think the simple format for representing the function introduced by Mitch is creating a bit confusion here. f_n(x) i.e. ''f subscript n'' as the image below is essentially different from f(x, n). http://s2.postimage.org/i72qs8mol/Code_Cogs_Eqn.jpg f_n(x) means the the primary variable of the ...” February 22, 2013 Tommy Wallach posted a reply to Quant help in the GMAT Strategy forum “Congrats on your 700 (and with your whole application)! -t” February 22, 2013 Tommy Wallach posted a reply to 700+ 1000 chemicals in the Sentence Correction forum “Hey All, Could somebody post the text from my company that you feel conflicts with this question? I''m just interested to see exactly what we say about it, but I''m not sure where people are drawing from. Anyway, whatever your rules are, (E) is the best answer here, even if it isn''t realistic in ...” February 22, 2013 Tommy Wallach posted a reply to 720 as a Military Officer . . . Retake? in the I just Beat The GMAT! forum “Hey Romeo, Well done, both on the service and the 720. To answer your question succinctly: nope. At the 720 level, there''s really no reason to study and try to get higher. You already fall into the "good GMAT score" category. The schools don''t really care beyond that. Honestly. Unless ...” February 22, 2013 Anurag@Gurome posted a reply to Percentages with Variables in the Problem Solving forum “Let us assume x = 2, y = 100, and z = 100 Hence, x is 2% of y ---> n = 2 And, z is 100% of y ---> m = 100 And, x is 2% of z Hence, the correct option must be equal to 2 when n = 2 and m = 100 A. (n/m) = 2/100 ---> NO B. (m X n) = 200 ---> NO C. (100 / The correct answer is ...” February 22, 2013 Anurag@Gurome posted a reply to Percentages with Variables in the Problem Solving forum “What you found is ratio of x and z. Ratio is not same as percentage. I hope you understand your mistake now. If not, then look at your first line : "x is n%: x = (n / 100) * y" x is n% of y but x/y = n/100 Here x/z = n/m but x is 100*(n/m)% of z” February 22, 2013 Tommy Wallach posted a reply to 4th (hopefully) final attempt. Please help! in the GMAT Strategy forum “Hey Independent, This is a piece of advice you will see all over this forum, but it''s incredibly important. Oftentimes, people think there score isn''t going up because they haven''t seen enough content/problems. This is not the case. I will tell you what I tell every student: You do not ...” February 21, 2013 Tommy Wallach posted a reply to a tale of two cities in the Sentence Correction forum “Aditya, You are totally right. Dammit. Is this Platinum GMAT again? We''ve found a number of errors in their material, so be careful when working with it. (C) is really questionable here. There is no referent for "that," as you correctly pointed out, Aditya. It wants to be ...” February 21, 2013 Tommy Wallach posted a reply to Horrible experience... I am not going for GMAT again :( in the I just Beat The GMAT! forum “Hey Naina, Thanks for the response. Indeed, taking practice tests not under strict conditions isn''t helpful, because you don''t know how you''ll do when the real thing comes along. Were your scores on those practice tests significantly better than you actually scored on test day? If so, you ...” February 21, 2013 Anurag@Gurome posted a reply to Permutation question - Combination in the Problem Solving forum “We have to select 8 members from (3 + 5 + 7 + 9) = 24 candidates Hence, total number of possible selections = 24C8 But some of these selections will have all the 5 sophomores in them which is not permitted by the condition "at most 4 Sophomores". We need to discard those selections. ...” February 21, 2013 Anurag@Gurome posted a reply to Fraction!!! in the Data Sufficiency forum “No. In number system, only an integer can be odd or even.” February 21, 2013 Anurag@Gurome posted a reply to DS - Decimals in the Data Sufficiency forum “Statement 1: x < 85/425 ---> x < 1/5 ---> x < 0.2 < 0.3 Hence, x is definitely not between 0.3 and 0.6 Sufficient Statement 2: x < 85/170 ---> x < 1/2 ---> x < 0.5 Now if x = 0.4 ---> x is between 0.3 and 0.6 But if x = 0.2 ---> x is not between 0.3 ...” February 21, 2013 Tommy Wallach posted a reply to Horrible experience... I am not going for GMAT again :( in the I just Beat The GMAT! forum “Hey Naina, Sorry to hear about your experience. One thing I can''t help but notice, however: you don''t mention how you were scoring on practice tests. I''d love to know all your practice test scores, because it would be surprising if you scored that low when you were scoring significantly higher ...” February 21, 2013 Tommy Wallach posted a reply to Kaplan Percentile Meaning in the GMAT Strategy forum “Hey Vom, There''s no way Kaplan doesn''t give a score...that would be crazy. And people are often posting Kaplan scores on here. Are you sure you aren''t taking a GRE (which scores in a much different way), or that you''re not missing the page? On the real test, an 85th percentile is 48-49. ...” February 21, 2013 Tommy Wallach posted a reply to Independent contractors in the Sentence Correction forum “Hey Wondering, Everything you wrote is correct, the only caveat is for this one: As written, that sentence isn''t correct, because the change in tense is illogical. You''d need some meaning aspect of the sentence to require a tense change. I''d have to add some time markers to make it ...” February 21, 2013 Tommy Wallach posted a reply to DS - Decimals in the Data Sufficiency forum “Hey Rajat, Use benchmarks to quickly do the math: 1) 425x < 85 If x = .3 .1 * 425 = 42.5 --> 3 * 42.5 = 117.5 That''s already way bigger than 85, so x has to be less than .3. You could also do this in your head, if you notice that 42.5 is 1/10th of 85, which means that .2 * 425 ...” February 21, 2013 Anurag@Gurome posted a reply to DS - Decimals and Ratio combined. in the Data Sufficiency forum “Always remember that any fraction whose denominator has only 2 and/or 5 as prime factors can be expressed as a terminating decimal. Otherwise, for example if the denominator has 3 or 7 or 11 etc as its prime factor, then the fraction can not be expressed as a terminating decimal. Statement 1: We ...” February 21, 2013 Tommy Wallach posted a reply to Is numbers considered an uncountable modifier? in the Sentence Correction forum “Hey Aditya, Yes to both of your last questions, which I think answers everything else. And "numbers" are just greater. Consider it idiomatic and leave it at that. It''s easier to do that than to try to derive some complex rule about it. Hope that helps! -t” February 21, 2013 Tommy Wallach posted a reply to Virtually all health experts agree that second-hand smoke in the Critical Reasoning forum “Hey Aditya, Yeah. No Platinum GMAT. No super GMAT. No Mega GMAT. For the love of all that is holy: stick to GMAT Prep, OG, and any of the major american companies (Manhattan Prep, Kaplan, Veritas, etc.). You shouldn''t need any other books than that. There is plenty of legitimate content out ...” February 21, 2013 Anurag@Gurome posted a reply to Experts pl help Tough one : area of the largest circle in the Problem Solving forum “Note that the lines are parallel to each other. Hence, the largest circle that can be inscribed such that it is tangent to both lines will have diameter equal to the shortest distance between the two lines. Now, the most easiest method to solve this question is to use the following formula of ...” February 21, 2013 Anurag@Gurome posted a reply to If p = 5.18r7, what is the result when in the Problem Solving forum “Tricky Solution: Just by looking at the answer we can figure out that the answer will not depend upon the actual value of r. Hence, we can assume any value for r and solve the question. Say, r = 0 Hence, p = 5.1807 and p rounded to the nearest thousandth = 5.181 Hence, required answer = ...” February 21, 2013 Anurag@Gurome posted a reply to If p = 5.18r7, what is the result when in the Problem Solving forum “Algebraic Solution: p = 5.18r7, where r is an integer such that 0 ≤ r ≤ 9 If 0 ≤ r ≤ 8, p rounded to the nearest thousandth = 5.18q, where q is an integer such that 0 ≤ q ≤ 9 and q = (r + 1) In this case, required answer = (5.18q - 5.18r7) = 0.0003 If r = 9, p rounded to the ...” February 21, 2013 Anurag@Gurome posted a reply to How to solve these FUNCTIONS? in the Problem Solving forum “g(a + b, a + b) = f(a + b) + f(a + b) = 2*f(a + b) g(a, a) = f(a) + f(a) = 2*f(a) g(b, b) = f(b) + f(b) = 2*f(b) Hence, we need to find a function which satisfies the condition 2*f(a + b) = 2*f(a) + 2*f(b), i.e. f(a + b) = f(a) + f(b) This relation will satisfied only by linear functions. ...” February 21, 2013 Tommy Wallach posted a reply to conclusion in the Critical Reasoning forum “Awwwww! Thanks, Soumita! : ) -t” February 21, 2013 Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum “Hey Duong, First of all, I''m really worried about the grammar in your writing, as it doesn''t bode well for the AWA section. I know it sounds pedantic, but really try to use these forums as an opportunity to use perfect grammar. Next, coming up with a list of small issues, such as the GMAT''s ...” February 20, 2013 Tommy Wallach posted a reply to Is numbers considered an uncountable modifier? in the Sentence Correction forum “Hey Aditya, Why does "more" go with both but "numbers" doesn''t? Because. Seriously. Just because. I don''t quite understand your question. There are an infinitude of words that do what you''re asking, so I can''t just list them out. Is there a more specific question in ...” February 20, 2013 Tommy Wallach posted a reply to Background Checks in the Sentence Correction forum “Mitch, FTW! : ) -t” February 20, 2013 Tommy Wallach posted a reply to The GMAT vs Me: A Bittersweet Journey in the I just Beat The GMAT! forum “Cool. One final thing to recommend: This may sound crazy, but I don''t recommend switching between loads of different books. I think slight differences in presentation, style, methodology, terminology, and other more subtle factors can make this very confusing. Also, I think it supports a view of ...” February 20, 2013 Tommy Wallach posted a reply to Virtually all health experts agree that second-hand smoke in the Critical Reasoning forum “Hey Aditya, I second everything Ceilidh said here, particularly that this is a bad question. To be honest, I think the case you make for (C) is pretty solid (if nobody in town smokes, it''s unlikely the legislation is going to affect much of anything). And because the GMAT so seldom does what ...” February 20, 2013 Tommy Wallach posted a reply to Including VS Including the following in the Sentence Correction forum “Hey Aditya, This is definitely a confusing rule, and I think we could stand to describe it slightly better in the book. The part before the colon does need to be an independent clause. However, you''re right in thinking that this would not be a complete logical sentence: X has many negative ...” February 20, 2013 Tommy Wallach posted a reply to Background Checks in the Sentence Correction forum “Hey Soumita, My understanding is that this type of construction is legal. I don''t necessarily know if it''s legal (used) on the GMAT, but it is grammatical in English: That no one came to my party last was disappointing, but not surprising. All I want to talk about is grammar. Is this the ...” February 20, 2013 Anurag@Gurome posted a reply to tough DS question ! in the Data Sufficiency forum “In one hour, Bonnie paints 1/x of the car Clyde paints 1/y of the car Together, they pain (1/x + 1/y) = (x + y)/xy of the car Hence, together they will take xy/(x + y) hour to finish painting the car Statement 1: Consider the following two case, x = 1 and y = 1 --> x = y x = 1 and y = ...” February 20, 2013 Anurag@Gurome posted a reply to Is |x−5|>4? in the Data Sufficiency forum “The question is asking whether the distance of x from 5 on the number line is greater than 4 or not. Statement 1: x² - 4 > 0 ---> x > 2 or x < -2 If x = 5 ---> |x - 5| = 0 < 4 If x = 10 ---> |x - 5| = 5 > 4 Not sufficient Statement 2: x² - 1 < 0 ---> -1 ...” February 20, 2013 Anurag@Gurome posted a reply to beat the DS from GMAT Club CAT in the Data Sufficiency forum “Statement 1: X² + YZ = XY + XZ --> X² - XY + YZ - XZ = 0 --> X(X - Y) - Z(X - Y) = 0 --> (X - Y)(X - Z) = 0 Hence, either (X - Y) = 0 or (X - Z) = 0 In both cases, (X - Y)(Y - Z)(X - Z) = 0 Sufficient Statement 2: XY - Y² = XZ - YZ --> XY - Y² - XZ + YZ = 0 --> ...” February 20, 2013 Anurag@Gurome posted a reply to question on number properties with square roots in the Problem Solving forum “Let us ignore the minus sign as of now. √5/5 = 1/√5 < 1 √7/7 = 1/√7 < 1 5/√5 = √5 > 1 7/√7 = √7 > 1 Now, √5 < √7 ---> 1/√5 > 1/√7 Hence, 1/√7 < 1/√5 < 1 < √5 < √7 Now, we''ll introduce the minus signs, i.e. we''ll multiply ...” February 20, 2013 Tommy Wallach posted a reply to Ron's sentence correction posts compilation in the Sentence Correction forum “Hey Hoji, Not quite sure what you''re suggesting. All of the posts are still here, cached, so there''s no need for them to be reposted. Also, to be honest, I don''t recommend anybody look at all of the issues that Ron has taken on on Beat the GMAT. By this way, this isn''t a knock on Ron. ...” February 20, 2013 Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum “Hey Patanjali, As Ron has said, asking for something as esoteric as "time modifiers" would not be helpful to either of us. Simply read up on adverbial modifiers, which modify verbs. It means nothing if it''s about time or any other aspect of modification; there are no fundamental ...” February 20, 2013 Tommy Wallach posted a reply to conclusion in the Critical Reasoning forum “Soumita! We are not inferring number from percents! I''m simply showing you how the percent work out by looking at numbers. Percents are always the same, no matter what set of numbers you use. Try it again, or try it with 100, or with x. You''ll find that the ratio between the categories will ...” February 20, 2013 Tommy Wallach posted a reply to 700+ Electorate in the Sentence Correction forum “Hey Aditya, This sentence is bad, let''s be clear. The GMAT, as far as I know, doesn''t make sentences as if a person is saying them. But this sentence would have to be spoken to make sense. Otherwise, what is this state. The one the person speaking lives in? That''s weird. In your ...” February 20, 2013 Anurag@Gurome posted a reply to A particular library has 75 books in the Problem Solving forum “65% of loaned books were returned by the end of the month. Hence, 35% of the loaned books are not in the library by the end of the month. We know, (75 - 68) = 7 books are not in the library by the end of the month Hence, 35% of loaned books = 7 books Hence, number of loaned out books in that ...” February 20, 2013 Tommy Wallach posted a reply to Modern Technology in the Sentence Correction forum “Hey Ron, I find this interesting. For me, the problem is the preposition "at," so the second example you give wouldn''t be a problem. I recognize that official question, but I think the addition of "in production history" makes all the difference. "Humans have ...” February 20, 2013 Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum “Hey Mo, In answer to your last question: yes, it''s better to eliminate the 4 wrong answers. In fact, you have to. There''s no other way to do SC. Seriously. Also, while I totally respect all the effort you''re making here, I think I''d be remiss if I didn''t say that your time would likely be ...” February 19, 2013 Tommy Wallach posted a reply to The GMAT vs Me: A Bittersweet Journey in the I just Beat The GMAT! forum “Hey Alias, Thanks for sharing the story. If you don''t mind, I''d like to point out a few things from your story that other people might be able to learn from. 1. I don''t entirely agree about setting realistic goals. Aiming for a 700 is not inherently unrealistic. And 2 months is enough time ...” February 19, 2013 Tommy Wallach posted a reply to GMATPrep: Lower End Insurance workers.. in the Sentence Correction forum “Hey Ion, Yes, it adds up to the same thing. The action is attributed to the subject, but it is also the result. In one case, the ministry is exposed. In the other case, the doctors are able to spend less time with patients. However you''d like to think about is fine, just note that it''s ...” February 19, 2013 Tommy Wallach posted a reply to comparison question - in the Sentence Correction forum “Hey Aditya, Not "could", and I can''t speak for any situation with "would" other than this sentence. But yes, the example sentence I gave, and the correct answer here, are good to go. -t” February 19, 2013 Tommy Wallach posted a reply to Modern Technology in the Sentence Correction forum “Hey Guys, Ron is absolutely right here. There are errors in the correct answer here: Modern tech allows manufacturers to make computers that are faster than those at any other time. "at any other time" is a prepositional phrase, and it should be modifying a verb: I ran faster ...” February 19, 2013 Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum “Hey Khalid, In case it isn''t clear "To be an expatriate is hard" is not the same as "To err is human". The latter is fine, as the subject is simply an infinitive. The first example, however, has a whole infinitive phrase, which is not okay. -t” February 19, 2013 Anurag@Gurome posted a reply to Number Properties in the Data Sufficiency forum “The question is simply asking whether k is even or not. Statement 1: k is divisible by 26, hence k is even ---> Sufficient Statement 2: As k is an integer greater than 1 but not divisible by any odd integer greater than 1, k must be an even integer ---> Sufficient The correct answer ...” February 19, 2013 Anurag@Gurome posted a reply to Real numbers!!! in the Problem Solving forum “Thanks for pointing it out, Ian. I completely missed the x = 0 scenario.” February 19, 2013 Anurag@Gurome posted a reply to Number Properties in the Data Sufficiency forum “Statement 1: We don''t know anything about k ---> Not sufficient Statement 2: We don''t know anything about j ---> Not sufficient 1 & 2 Together: As 30 = 2*3*5, j is divisible by at least 3 different prime numbers. Whereas k = 1000 = (2*5)^3 is divisible by only two different prime ...” February 19, 2013 Anurag@Gurome posted a reply to Real numbers!!! in the Problem Solving forum “Statement 1: By definition, if x is a nonnegative real number then √x is always nonnegative. As √x is not positive, then we can only conclude that x is not a positive real number. But x can be either equal to zero or a negative real number or not real at all. Not sufficient Statement 2: As ...” February 19, 2013 Anurag@Gurome posted a reply to what!!!! in the Problem Solving forum “Factors of 25 are 1, 5, and 25 Hence, x, y, and z must be any of these. Hence, x, y, ad z must be odd integers. Hence, the product xyz must be odd. The correct answer is D. If you want to know why others are always not true... A. x = y = z = 1 ---> xyz < 25 B. x = 1, y = 5, and z ...” February 19, 2013 Anurag@Gurome posted a reply to Soccer team - Veritas Question Bank in the Problem Solving forum “The selection groups are {1, 2}, {3, 4}, and {5, 6, 7} We can select only one number from each group. Now, 4 can be selected only if 2 is selected And, 3 can be selected only if 5 is selected If 1 is selected, we cannot select 4 and we have to select 3. Then we cannot select 6 or 7, we have ...” February 19, 2013 Anurag@Gurome posted a reply to Help! Practice Test Gone Wrong in the Data Sufficiency forum “Refer to the posts here << http://www.beatthegmat.com/gmat-prep-line-slope-t67624.html#304548 >> and here << http://www.beatthegmat.com/gmatprep-i-t72401.html#327945 >>” February 19, 2013 Anurag@Gurome posted a reply to Range of heights in the Data Sufficiency forum “I assume it''ll be "...the greatest height is h." Now, let us assume that least height of kids in A and B are respectively a and b. Hence, r = (g - a) and s = (h - b) Hence, a = (g - r) and b = (h - s) We need to determine whether a > b or not, i.e. (g - r) > (h - s) or ...” February 19, 2013 Tommy Wallach posted a reply to comparison question - in the Sentence Correction forum “Hey Aditya, I think this is fair game with would. For example: I ran much faster than I thought I would. Fine sentence. There''s an understood "run" at the end, even though the verb in the sentence is "ran". -t” February 19, 2013 Anurag@Gurome posted a reply to Factorization in the Data Sufficiency forum “If the unit''s digit of any number is 0, then the number must be a multiple of 10, i.e. multiple of both 2 and 5. Statement 1: N is multiple of 14 and 25. Hence, N is a multiple of both 2 and 5. Sufficient Statement 2: Clearly N is multiple of both 2 and 5. Sufficient The correct ...” February 19, 2013 Tommy Wallach posted a reply to Background Checks in the Sentence Correction forum “Hey All, Let''s give this one a go. Avik, never tell people to cross off answer choices just for bad construction (and don''t do it yourself!). You can always use grammar!: (A) "Which" requires a comma. "necessary prerequisite" is redundant. (B) "Their" is ...” February 18, 2013 Tommy Wallach posted a reply to comparison question - in the Sentence Correction forum “Heyo, I''ll weigh in on this! The note already made is not correct: (A) This attempts to compare two deterioration times. But they word "seemed" doesn''t work. It would say: QD plastics are taking more time to deteriorate than they originally seemed to take. The only way you can ...” February 18, 2013 Tommy Wallach posted a reply to William Shakespeare was a real, historical person in the Sentence Correction forum “"Which" should not be used to modify a fact, as it does here. Unidiomatic use of "attributed" (you say "attributed to" not "attributed as" Will isn''t accepted himself...it''s the idea that is now accepted. "Considered" never has the ...” February 18, 2013 Tommy Wallach posted a reply to parallel and pronoun issue in the Sentence Correction forum “Hey All, Good discussion here already. Just a bit more detail: (A) Missing verb "think" (there''s no verb that would require "that"). Commas are weird. (B) Same as (A), also "Would" is incorrect. "Would" means there''s something in the way of them ...” February 18, 2013 Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum “Hey Mo, Sounds like you''re really taking this seriously. We looks forward to your updates! -t” February 18, 2013 Tommy Wallach posted a reply to GMATPrep: Lower End Insurance workers.. in the Sentence Correction forum “Hey Ion, You don''t quite seem to be getting this. Michael''s example on that other thread is incorrect. That sentence you cite would never be on the GMAT. As Guru and I have said, The comma -ing structure is an adverbial modifier. So it will not modify nouns. In your example, you once ...” February 18, 2013 Tommy Wallach posted a reply to Modifier ( Conditional vs Without) in the Sentence Correction forum “Hey Sana, As I''ve said, it really doesn''t matter here. If the sentence doesn''t use if/unless, it isn''t technically conditional, but there''s no functional difference between: A student won''t succeed without good grades. A student won''t succeed unless she has good grades. -t” February 18, 2013 Anurag@Gurome posted a reply to Prime saturated in the Problem Solving forum “In other words, n will be prime saturated if the square of largest prime factor of n is smaller than n. Let''s check the options one by one... A. 6 = 2*3 ---> 3² > 6 ---> NO B. 35 = 5*7 ---> 7² > 35 ---> NO C. 46 = 2*23 ---> 23² > 46 ---> NO D. 66 = 2*3*11 ---> ...” February 18, 2013 Tommy Wallach posted a reply to Modifier ( Conditional vs Without) in the Sentence Correction forum “Hey Agautam, Yes, I believe Sana is wrong and this is a conditional sentence. However, I will add that it doesn''t matter. Issues of condition aren''t tested on this question. It''s other grammatical issues that come into play. -t” February 18, 2013 Tommy Wallach posted a reply to GMATPrep: Lower End Insurance workers.. in the Sentence Correction forum “Hey Ion, Believe it or not "I" is not beginning the career. "Beginning the career" is an adverbial modifier, modifying the entire preceding clause. Perhaps a clearer example, agian: I won the contest, pleasing my father greatly. Again, "pleasing" is not ...” February 18, 2013 Tommy Wallach posted a reply to DS - Range Question - Gmat Prep Extension Pack - Hard in the Data Sufficiency forum “Always a good rule! : ) -t” February 18, 2013 Tommy Wallach posted a reply to conclusion in the Critical Reasoning forum “Hey Soumita, You''re absolutely right that we can''t infer numbers from percents, but nobody''s asking you to do that! There are no numbers in (C)! Imagine there are 30 people in the class: 10 have significant financial responsibilities 24 have never taken a personal finance class 24 have ...” February 18, 2013 Tommy Wallach posted a reply to Time required to prep for GMAT in the GMAT Strategy forum “Hey Ragha, Short answer: Yes. That''s plenty of time. Medium Answer: Yes, and that''s plenty of time, but getting a score as high as 740 involves some real learning/changing of your techniques, so make sure you''re open to them. This is more than enough time, but if you don''t study ...” February 18, 2013 Tommy Wallach posted a reply to DS - Range Question - Gmat Prep Extension Pack - Hard in the Data Sufficiency forum “Hey Buzz, 1. Not quite. If the statement said that the range for that many folks was$15,000, then we would have to assume some family was at either endpoint of that range. But if it simply says they are all between $20,000 and$35,000, they could all be the same, for all we know. 2. Actually, ...”
February 18, 2013
Tommy Wallach posted a reply to primes again!!! in the Data Sufficiency forum
“Hey Ian, Agreed on all counts. Good talk. : ) -t”
February 17, 2013
Tommy Wallach posted a reply to Castle bult by royals in the Sentence Correction forum
“Hey Patanjali, That''s a real stretch! If you ever find yourself thinking "What if this is being said to someone while both of them are looking at it in a book," you''re probably overthinking it. : ) -t”
February 17, 2013
Tommy Wallach posted a reply to primes again!!! in the Data Sufficiency forum
“Hey Ian, I accept this challenge! I don''t see how the second definition implies that that''s all that can be in something. In fact, the second definition you cite is this: • be made up of (a number of things); consist of: borscht can contain mainly beets or a number of vegetables. ...”
February 17, 2013
Tommy Wallach posted a reply to Modifier ( Conditional vs Without) in the Sentence Correction forum
“Hey Agautam, Just to add to Sana''s notes here. Prepositional modifiers can modify both nouns and verbs. When they modify nouns, they should touch them. But when they modify verbs, they do not have to touch them (and whatever noun they are touching is irrelevant). In this case, we''re modifying ...”
February 17, 2013
Tommy Wallach posted a reply to GMATPrep - Since digital recording offers.... in the Sentence Correction forum
“Hey Sana, You''re ignoring meaning. Think about what that would really mean. That''s not how you accumulate the music. It''s a list of things you can do with the music after you''ve accumulated it. -t”
February 17, 2013
Tommy Wallach posted a reply to 600-700 Space missions in the Sentence Correction forum
“Hey All, I''ll weigh in, though there''s already been some good conversation: (A) "Would" implies that this is conditional, rather than definitive. The meaning here, however, is that the proposals already exist, and so the proposals simply "suggest tracing" (which would ...”
February 17, 2013
Tommy Wallach posted a reply to MUTUAL FUND in the Sentence Correction forum
“Hey Imskpwr, Again with these wacky wacky questions of yours. I continue to think this approach to thinking about the GMAT is a dangerous one, because it isn''t holistic. And I''ll continue to say so to whomever will listen! Focus on major grammatical issues and always consider all 5 answer ...”
February 17, 2013
Tommy Wallach posted a reply to GMATPrep: Lower End Insurance workers.. in the Sentence Correction forum
“Hey Ion, What an ugly sentence. For the sake of others, let''s go through all of these real quick: (A) Parallelism way off (imposing and requiring and spend). Use of the original participle "imposing" is awkward. (B) Third element of the list would say: "plans spending less ...”
February 17, 2013
Tommy Wallach posted a reply to primes again!!! in the Data Sufficiency forum
“Hey Guys, I''m on the fence on this one. Ian is absolutely right that the GMAT doesn''t play linguistic tricks very often. However, I''m not sure I''d call this a linguistic trick. There''s a fairly major difference between: Set X contains consecutive integers Set X contains only consecutive ...”
February 17, 2013
Tommy Wallach posted a reply to GMATPrep - Since digital recording offers.... in the Sentence Correction forum
“Hey Sana, Jim''s totally right here. Anything after "Since" will always be a modifier of some kind (either a subordinate clause, or just a prepositional phrase). And the main verb is "accumulate," preceded by the helping verb "can". What is it that you think is ...”
February 17, 2013
Tommy Wallach posted a reply to erroneous in the Sentence Correction forum
“Hey Sana, Indeed, the "it" issue has been explained. As for the "them," that would be "nuclear plants". It''s a bit ambiguous (because it could also be referring to "other types of power plants," but the GMAT could possibly get away with it, if there were ...”
February 17, 2013
Tommy Wallach posted a reply to erroneous in the Sentence Correction forum
“Whoa. There is no need to discuss extraposed structures here. And they are mega-rare on the GMAT. Oy. I love knowing a lot about grammar, but I think there is such a thing as overthinking it! : ) -t”
February 17, 2013
Tommy Wallach posted a reply to erroneous in the Sentence Correction forum
“Hola, The instances of "it," as far as I can see, have no antecedent. They are expletives, so don''t require an antecedent. The sentence structure of both seems fine; it only looks awful because of the other problems I mentioned. -t”
February 17, 2013
Tommy Wallach posted a reply to 680 - Should I stop here? in the GMAT Strategy forum
“Hey Dogie, Just the difference between the OG books (which are only questions), and something like the books published by my company (or Veritas, or Kaplan...not trying to hard sell ya!). -t”
February 16, 2013
Tommy Wallach posted a reply to Pl rate my AWA- my first attempt in the GMAT Essays (AWA) forum
“Hey Rajat, Great argument here overall. Your points are really solid, and the writing is clear. You should easily score what you need to score (the essay is really more like a pass/fail, where 4.5 or up is a pass). That being said, you could stand to focus a bit on grammar: The argument ...”
February 16, 2013
Tommy Wallach posted a reply to pls rate my essay...cleare in the GMAT Essays (AWA) forum
“Hey Mehaksal, Can I ask where you got this prompt? To be totally honest, it does not seem like a legitimate essay prompt. I say this because there aren''t any real logical assumptions made. The essay wants you to take advantage of practical problems with the roll-out of the plan (i.e. what about ...”
February 16, 2013
Tommy Wallach posted a reply to Castle bult by royals in the Sentence Correction forum
“Hey Guys, Great notes already, but I thought I''d do a slightly more in-depth study: (A) The verb "stood" is in the past tense, implying that the castle isn''t there anymore. This is incorrect because the first half of the sentence says "this castle" and "this ...”
February 16, 2013
Tommy Wallach posted a reply to erroneous in the Sentence Correction forum
“Hey Imskpwr, I know you''re gonna kill me, but I''ll continue to recommend you post entire questions when asking stuff here. And here are the reasons: 1) The GMAT tests your ability to work out the best choice among a number of options. Often, there is no perfect answer choice. So trying to ...”
February 16, 2013
Tommy Wallach posted a reply to GMATPrep - Since digital recording offers.... in the Sentence Correction forum
“Hey Guys, I agree with Jim here that it''s more or less impossible to work out what the correct subject is. Personally, I think that you could transfer collections of music as well as you could transfer the music itself, but as Jim says, the question doesn''t force you to make that decision, and ...”
February 16, 2013
Tommy Wallach posted a reply to 680 - Should I stop here? in the GMAT Strategy forum
“Hey Dogie, It''s not a question of what the average person does, but of what the schools care about. And they simply don''t care if you take the test multiple times (2 or 3...you might start running into danger around 6...). It''s not the norm for US standardized testing necessarily (LSAT can be ...”
February 16, 2013
Tommy Wallach posted a reply to Modems in the Problem Solving forum
“Hey Prashant, A good rule on plugging in questions is never pick anything that makes life too easy. This is because it''s possible for more than 1 answer choice to get you the same value if you do so. Why? Imagine this scenario: (A) 100s (B) 10000/s With these answer choices, if you plug ...”
February 16, 2013
Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum
“Hey Mo, You should maybe research the algorithm more thoroughly on your own, because it''s silly for me to give a big long explanation of how it works here, when there are already hundreds. In short, it''s always a question of the difficulty of the questions, and at the highest levels, it''s also ...”
February 16, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“I think they are both wrong for meaning reasons, because neither of the sample sentences I gave would make sense here. Perhaps an easier way to think of it is that "limitation" isn''t really the right word here. There can be limitations on water use, but not on just how much water there ...”
February 16, 2013
Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum
“Hey Mo, Lots of questions here. Let''s do this: 1) Yes, every question has a pretty specific difficulty attached to it. 2) A high 700 scorer needs to answer a high-percentage of questions right. At that level, the vast majority of questions will be top-tier questions. (Keep in mind, at LOWER ...”
February 15, 2013
Tommy Wallach posted a reply to Did u get through any top MBA programs with 4 ASA in the GMAT Essays (AWA) forum
“Hey Krishna, A 4 is still considered passable at most major schools. However, if you have curiosity about this, don''t ask random people on here. The truth is that every application is made up of so many individual pieces, nobody will be able to tell you anything that will mean anything. But you ...”
February 15, 2013
Tommy Wallach posted a reply to Comparison Question in the Sentence Correction forum
“Two things. First there''s the "this" error that Ceilidh mentioned, which makes this whole question useless and terrible. The error in (E) that this terrible author meant to include is the faulty comparison at the end: "...concerns about crime are greater than health ...”
February 15, 2013
Tommy Wallach posted a reply to OG 13 question 57 and 132, similar questions or not? in the Data Sufficiency forum
“Hey Shib, One last thing: never forget that the actual content tested on the GMAT is quite small (ends at about 8th grade...13 or 14 years old). But because those GMAC folks are cagey, they''re able to write thousands upon thousands of different questions. How? Because they explore each little ...”
February 15, 2013
Tommy Wallach posted a reply to How prepared am I really? in the GMAT Strategy forum
“Hey Mo, A deeper question is why you''re aiming for a 750+. In my opinion, there''s no good reason to go for this. Once you''re in the 720 range (the average score at a top ten school), I think it makes very little difference. That isn''t to say it isn''t nice to have a higher score, but I don''t ...”
February 15, 2013
Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum
“Hey Avik, I think we''re overthinking this, but I don''t quite understand your point. A "time" modifier could never modify a noun, so there''s no confusion over whether it''s modifying "Paris". It simply can''t. -t”
February 15, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
February 15, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“Hey imskpwr, I''m not contradicting myself at all. I said we could get into hypotheticals after looking at the question. And we have. Your hypotheticals are both wrong. As for issues with d and e, there is the less/fewer issue, as well as meaning issues that were addressed in my first response to ...”
February 15, 2013
Anurag@Gurome posted a reply to work and time in the Data Sufficiency forum
“I''m assuming the read underlined load is same as the one in blue. Otherwise, answer is definitely going to be E. The question is asking whether all of them together will finish hauling the load in 15 minutes or not. To answer this we need to know the work capacity of the mules. 16 horses in ...”
February 15, 2013
Anurag@Gurome posted a reply to 2^x - 2^(x-2) = 3(2^13) what is x? in the Problem Solving forum
“Another tricky method to solve this problem is to expressing the right side of the expression as powers of of 2 only so that we can compare it with the left side. 3*(2^13) = (4 - 1)*(2^13) = (2^2 - 1)(2^13) = 2^15 - 2^13 = 2^15 - 2^(15 - 2) hence, x = 15”
February 15, 2013
Anurag@Gurome posted a reply to 2^x - 2^(x-2) = 3(2^13) what is x? in the Problem Solving forum
“2^(x - 2) = (2^x)*(2^(-2)) = (2^x)/(2^2) --> (2^x) - 2^(x - 2) = 3*(2^13) --> (2^x) - (2^x)/(2^2) = 3*(2^13) --> (2^2)*(2^x) - (2^x) = 3*(2^13)*(2^2) --> (2^x)*[(2^2) - 1] = 3*(2^15) --> 3*(2^x) = 3*(2^15) Comparing the both sides, x = 15”
February 15, 2013
Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum
“At a second glance, I don''t think it''s a modifier issue. At least not to the extent that you could cross it out for that. HOWEVER, there is a definite improvement in clarity/meaning if we put Josephine Baker directly after the opening phrase, for the reasons that have now been stated ad nauseam. ...”
February 15, 2013
Tommy Wallach posted a reply to 700+ Electorate in the Sentence Correction forum
“Hey Guys, Gotta agree with Avik here. The GMAT will not use "this" to describe something that hasn''t been discussed before. It''ll just use "the". The example of "this summer" is not correct. In that example "this" refers to the most recent (or upcoming ...”
February 15, 2013
Tommy Wallach posted a reply to Experts Help Needed: Comparison Tested to this Degree? in the Sentence Correction forum
“Hey Nisagl, Absolutely right, in your explanation, and your example of a sentence that would be incorrect. Of course, as you noted, in your "incorrect" example, there is a possible legitimate read, if we are comparing the money made by the toy division to the money that the defense ...”
February 15, 2013
Tommy Wallach posted a reply to "Consider as" issue in the Sentence Correction forum
“Hey Rajat, It''s hard to separate out what is an idiom or comparison error here, as they get mashed together. (B)''s comparison is pretty bad, because it seems to be comparing "Acid rain" to "in the East". As if "in the East" is another kind of problem. See what I ...”
February 15, 2013
“Hey Nona, Agreed with Ceilidh. Also, if you got a 560 on a practice test, 540 is well within the range of a normal score, so it doesn''t make too much sense to be surprised. Anyway, the last thing I''ll say is that you mentioned that you often see there are better/more efficient methods, but ...”
February 15, 2013
Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum
“Hey All, Looks like this has been put to bed, but I just wanted to back up the Guru. You can get rid of (E) purely on the "being," which the GMAT doesn''t do. You can also say that the location of the modifier confuses the issue. This is adverbial, so it''s modifying the verb ...”
February 14, 2013
Tommy Wallach posted a reply to negative correlation - how? in the GMAT Integrated Reasoning forum
“Hey Mk, While all that you said may be true, advanced statistics aren''t really tested on the GMAT. So you don''t need to know much other than a pure positive or a pure negative correlation (i.e. When X goes up, Y goes up; or when X goes down, Y goes up). -t”
February 14, 2013
Anurag@Gurome posted a reply to MGMAT: Inequalities & Absolute Value (why did A.V. pop u in the Problem Solving forum
“There is another way to solve this problem without bringing absolute values if you''re not confident with them. --> (x + 1)² < 36 --> (x + 1)² - 6² < 0 --> (x + 1 - 6)(x + 1 + 6) < 0 --> (x - 5)(x + 7) < 0 Hence, (x - 5) and (x + 7) are of opposite signs. Hence, ...”
February 14, 2013
Anurag@Gurome posted a reply to MGMAT: Inequalities & Absolute Value (why did A.V. pop u in the Problem Solving forum
“Just remember that by definition square root of any algebraic quantity x² is |x| Hence, square root of (x + 1)² is |x + 1|, square root of (x + y + z + 2xy + abc)² i |x + y + z + 2xy + abc| etc. For a more detailed explanation, refer to the post here >> ...”
February 14, 2013
Anurag@Gurome posted a reply to Inequality - MGMAT in the Problem Solving forum
“a²b > 1 ---> a² and b are of same sign As a² is always positive, b is also positive. Hence, a² > 1/b and 1/b > 1/2 Hence, a² > 1/2 Only option D works. The correct answer is D.”
February 14, 2013
Tommy Wallach posted a reply to Inequalities Solutions (MGMAT Prep Question) in the Problem Solving forum
“Hey Amy, Annoying as it may sound, could you post it in a separate thread, then PM me about it. We like to keep threads 1 question per... -t”
February 14, 2013
“Hey Nona, Had you taken practice tests? The amount of study is slightly irrelevant if you never took any practice tests (so you don''t know where you started). Also, you say you studied for 3 months, but studying for 3 months without taking any practice tests is a very bad idea. Of course, ...”
February 14, 2013
Tommy Wallach posted a reply to Inequalities Solutions (MGMAT Prep Question) in the Problem Solving forum
“Hey Amy, Basically, you want to divide by 7 because then you won''t have any fractions. Isolating the AB is nice, but it''s nicer to have all integers (also, having something greater than 1 is helpful, considering what the question was asking)! You could always do it the other way... AB > ...”
February 14, 2013
Tommy Wallach posted a reply to "Consider as" issue in the Sentence Correction forum
“Hey Sana, Hemant''s response here is pretty great. I can add a couple other things. (A) "not yet" error. Missing "it is" for the comparison. (B) the "not" needs to go before considered, rather than after it. Missing "it is" as well. (C) correct. ...”
February 14, 2013
Tommy Wallach posted a reply to attach the gmat in the resume? in the Lounge forum
“Hey Simone, What kind of school are you applying to? A 680 should be impressive wherever you''re applying, if it isn''t a B-school. -t”
February 14, 2013
Tommy Wallach posted a reply to Harry Potter Book in the Sentence Correction forum
“Hey Soumita, Not sure what you mean. None of the answer choices discuss any worth that isn''t monetary... -t”
February 14, 2013
Tommy Wallach posted a reply to Picking apples in the Data Sufficiency forum
“Hey Guys, Very important rule here. On the GMAT, this is NOT a rule. I am very nervous if you read this anywhere. That''s a rule from middle school algebra. On the GMAT, generally they will subvert rule, in any one of a million ways they know how to subvert it. For example: What''s x? ...”
February 14, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“Hey Imskpwr, This is the issue with hypothetical examples. In this case, getting through the answers is quite easy. (A) Perfect! (B) "Where" needs to modify a place, but it''s modifying "clans". Also, "that was less limited" is modifying "water," ...”
February 13, 2013
Tommy Wallach posted a reply to 700+ Mary Leakey [GMATPrep] in the Sentence Correction forum
“Oops! You''re right. But either way, the logic applies to both, unless you think I missed a major issue. In general, we ask people to only post one question at a time in a thread. -t”
February 13, 2013
Tommy Wallach posted a reply to From 1982 to 1987 sales of .. in the Sentence Correction forum
“It''s redundant. If something "occurred," then by definition, it "was." You don''t need to say both. X occurred on Friday. Occurring on Friday was X??? -t”
February 13, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“Hey Imskpwr, As in you made up the answer choices yourself, or they are official answer choices? I really recommend you post the whole, real question. If you want to get into hypothetical from there, we can. -t”
February 13, 2013
Tommy Wallach posted a reply to Experts Help Needed: Comparison Tested to this Degree? in the Sentence Correction forum
“Hey Nisagl, Yes. Non-relative pronouns should generally be replaceable with a word/phrase already used in the sentence. However, be careful: "which" is a relative pronoun. Relative pronouns are simply modifiers, and there antecedent is defined by whatever they touch: The house that I ...”
February 13, 2013
Tommy Wallach posted a reply to MGMAT: LINKING VERB as PARALLEL MARKER in the Sentence Correction forum
“Hey Imskpwr, I think you''re way overthinking this at this point! We''ve got a beautiful noun and a lovely verb! Who cares if it''s a modal (the GMAT doesn''t test anything about modals that requires even knowing what they are!)? "likely" is just an adverb that takes the preposition ...”
February 13, 2013
Tommy Wallach posted a reply to Cars and Trucks in the Sentence Correction forum
“I explained why already! : ) The "themselves" is not idiomatically correct. They''re using an idiomatic version of "alone" that means "just". But "themselves" can''t mean "just," so it makes no sense here. -t”
February 13, 2013
Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum
“Hey Duong, If this error is not comprehensible to you, you definitely need to spend more time with a basic GMAT SC book. Misplaced modifiers are one of the more common mistakes you''ll see on the test. Misplaced modifiers: A noun modifier should touch the noun it modifies. In this case, ...”
February 13, 2013
Tommy Wallach posted a reply to 700+ Mary Leakey [GMATPrep] in the Sentence Correction forum
“Hey Challenger, This is a nice, straight-forward parallelism question. Let''s hit it one by one. (A) ...contributed...with her discovery...and painstakingly documenting... Wrong. Discovering/documenting would be parallel. (B) ...contributed...by her discovery...and by painstakingly ...”
February 13, 2013
Tommy Wallach posted a reply to From 1982 to 1987 sales of .. in the Sentence Correction forum
“Hey All, Uh-oh. I don''t like all this talk of concision. Nothing here is a concision issue. It''s grammar! (A) I''d want a comma after "from 1982 to 1987," but otherwise solid! (B) Incorrect usage of the present tense. That was the annual increase back then! (C) Incorrect ...”
February 13, 2013
Tommy Wallach posted a reply to More FC please in the Sentence Correction forum
“What''s FC? And who''s Paggust? You might want to edit the post to put his name in the title, if you want him to reach out! : ) -t”
February 13, 2013
Tommy Wallach posted a reply to The Growth in the Sentence Correction forum
“Hey Soumita, I don''t actually think this question is so bad; the meaning issues are definitely fair. However, in both (A) and (B), there should be a comma after the opening modifier "between 2010 and 2012". Beyond that, (A) is great. (B) has lots of problems. "The growth was ...”
February 13, 2013
Tommy Wallach posted a reply to Experts Help Needed: Comparison Tested to this Degree? in the Sentence Correction forum
“Hey wcheng, I would say yes, unfortunately. To be honest, it''s not as complicated here as it looks. Whenever you get a pronoun like "that," just make sure you can plug something from the sentence in in a logical way. In the original sentence here, you''d get: The performance of the ...”
February 13, 2013
Tommy Wallach posted a reply to Verbal Strategy? in the I just Beat The GMAT! forum
“Hey Shashali, Looks like you were trying to reply to something, but you don''t need to start a new post to do that. All you need to do is click the "reply" button in the actual thread. Also, there are lots of posts on how to boost your verbal score. I suggest looking through some ...”
February 13, 2013
Tommy Wallach posted a reply to MGMAT: LINKING VERB as PARALLEL MARKER in the Sentence Correction forum
“Hey Imskpwr, First issue: The bodybuilder was exhausted by the long day on the slopes. Fair enough, this is passive. Simply replace as: The bodybuilder is exhausted. No problem. "This pizza is likely to make me sick." This is not an incorrect sentence. "Eating ...”
February 13, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“Hey Again, Is this from an official question? Could you post the whole thing? The reason why I ask is that neither of these are particularly good. That doesn''t mean one of them isn''t right, but that''s why it''s ONLY good to practice with official questions (or questions from very reputable ...”
February 13, 2013
Tommy Wallach posted a reply to Think of X as Y Issue in the Sentence Correction forum
“Hey Sana, Yes, that is the traditional error known as a misplaced modifier. If you can''t immediately recognize that one, you definitely need to spend more time with the sc book, as it comes up constantly. T”
February 12, 2013
Tommy Wallach posted a reply to MGMAT: LINKING VERB as PARALLEL MARKER in the Sentence Correction forum
“Hey imskpwr, There is nothing wrong with connecting an adjective to a noun with a linking verb: The bodybuilder was exhausted by the long day on the slopes. I am sick and tired of all these GMAT questions. He is French. And my sample sentence is fine: "This pizza is likely to make me ...”
February 11, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“Hey imskpwr, Actually, no. There is a slight meaning difference: "limit to" simply means that a limit exists. "limit on" means that the limit has been placed there by someone. Examples: There is a limit to my patience. --> Correct. There is a limit on my ...”
February 11, 2013
Tommy Wallach posted a reply to A number in the Sentence Correction forum
“Hey Rajat, Yes! Good spot! The semicolon part is totally wrong, so the question is incorrectly written. Your second issue is also true, but only because of the location of the modifier. You could easily say: The world record for hot dogs eaten in one minute stands at 82, a number that far ...”
February 11, 2013
Tommy Wallach posted a reply to Please rate my essay! in the GMAT Essays (AWA) forum
“Hey hkstrz, Your essay is great. Three solid points, a good length, and perfect structure. You''re already in the pass category of this pass/fail exercise, but if you''re looking for notes, you could try to add a little bit of length. For example, your first paragraph is a bit short. Also, the ...”
February 11, 2013
Tommy Wallach posted a reply to MGMAT: LINKING VERB as PARALLEL MARKER in the Sentence Correction forum
“Hey Imskpwr, That section in the book is a bit confusing. But to be clear, you only need to worry about this when matching a noun to a noun. When using a linking verb to match a noun to an adjective, obviously you don''t need (or want) parallelism. For example: I am purple. (noun to ...”
February 11, 2013
Tommy Wallach posted a reply to IDIOM: TO vs ON in the Sentence Correction forum
“Hey Imskpwr, We say "There''s a limit to your love." We say "A limit has been placed on how many chocolates one person can eat." We say "There''s a 10-minute limit on practices sessions." So the answer is...both! -t”
February 11, 2013
Tommy Wallach posted a reply to A number in the Sentence Correction forum
“Hey Soumita, "Number" is complicated, because the plurality is based on whether the word number is the subject of the sentence, or the thing that comes after it. Watch: The number of dogs is large. In this sentence, we know that the subject is the word number. How? Because ...”
February 11, 2013
Tommy Wallach posted a reply to Postcards and Postboxes in the Problem Solving forum
“Hey Gughan, Perhaps I''m misunderstanding you, but I don''t see any way in which it''s different for letterboxes to receive mail than to send it. -t”
February 11, 2013
Tommy Wallach posted a reply to 600+ Wind in the Sentence Correction forum
“Hey All, A few weird things in people''s explanations here, so I wanted to weigh in. (A) In this answer choice, we never get the "that" required by the idiom. Also, the underlined portion creates something like an independent clause, so it''s basically a run-on sentence from ...”
February 11, 2013
Tommy Wallach posted a reply to Postcards and Postboxes in the Problem Solving forum
“Hey Gughan, You just asked the same question! What you may have meant was "How many ways can 6 letters be posted in 10 letterboxes." Slots method: 1. 6 slots 2. Each slot has 10 options (because each letter can be put into any of the 10 boxes) 10 10 10 10 10 10 10^6 ...”
February 11, 2013
Tommy Wallach posted a reply to negative correlation - how? in the GMAT Integrated Reasoning forum
“Hey Kunal, You are correct. In that set, there wouldn''t be a correlation you could call either positive or negative. -t P.S. Indeed, BtG does not like white spaces in posts. It''s a bit like trying to leave silence on your iPhone voice mail. Ever tried it? No dice.”
February 11, 2013
Tommy Wallach posted a reply to Think of X as Y Issue in the Sentence Correction forum
“Hey Sana, Happy to help, but let''s look at all the answers! The idiom is "Are not X but are Y" (assuming that X and Y contrast) Two problems here. The idiom "not as X but Y" requires two nouns, whereas we get an adjective and a noun. Because of that, the ...”
February 11, 2013
Tommy Wallach posted a reply to SC Section help in the GMAT Strategy forum
“Hey Kkadvent, I wanna jump on this too, if you don''t mind. It sounds to me like you know what you have to do, and you''re not doing it. When you say "I''m going on instinct," I would say: "Well stop!" In other words, if you can''t do it with grammar...don''t do it at all. ...”
February 11, 2013
Tommy Wallach posted a reply to Postcards and Postboxes in the Problem Solving forum
“Hey Gughan, This is a weird sort of combinatorics question, which I would solve with the slots method: 1. Find # of slots (decisions to be made) 2. Fill in possibilities at each decision point 3. Figure out if Order matters or not (or a hybrid) 4. If order matters, multiply all slots ...”
February 11, 2013
Anurag@Gurome posted a reply to Two More Tricky Problems for me in the Problem Solving forum
“Refer to the posts as follows... For problem 1 >> http://www.beatthegmat.com/geometry-t131113.html#516326 For problem 2 >> http://www.beatthegmat.com/function-problem-t72321.html#327643”
February 11, 2013
Anurag@Gurome posted a reply to y-intercept of line l? in the Problem Solving forum
“If the slope and y-intercept of a line in xy plane are m and c respectively, then the line can be represented by the equation y = mx + c and the x=intercept of the line will be -c/m Statement 1: m = 3c ---> Not sufficient Statement 2: -c/m = -1/3 ---> m = 3c ---> Not sufficient 1 ...”
February 11, 2013
Tommy Wallach posted a reply to IR in the GMAT Integrated Reasoning forum
“Hey Guys, I wanted to add one other quick thing. My biggest problem with this question is it doesn''t make clear whether the price listed is a nightly rate, or the rate for all four nights. It also doesn''t make clear if the rates are per person. Finally, it''s unclear whether the refund ...”
February 8, 2013
Tommy Wallach posted a reply to IR in the GMAT Integrated Reasoning forum
“Hey Guys, MSR is indeed the toughest question type on IR. Whether or not you can skip it is difficult to say. Some general rules: 1) IR, as a whole, is not particularly important. This is because the main thing schools care about remains the 2-800 score. Also, because IR is so new, it''ll be ...”
February 8, 2013
Tommy Wallach posted a reply to New Proposal (need of vs need for) in the Sentence Correction forum
“(A) "larger transparency" is nonsensical (it''s not about size). "Data" is singular here (you can tell from the "is"), so "they" is wrong. Encourage/discourages isn''t parallel. (B) "need for" is the correct idiom here. A bigger issue is the use ...”
February 8, 2013
Tommy Wallach posted a reply to divisible by 3 in the Problem Solving forum
“And just to finish up this trinity of expert advice pieces, I''ll just put the evenly spaced set stuff right here: Equation for Sum of an Evenly Spaced Set: Average * # of terms Equation for Average of an Evenly Spaced Set: (First Term + Last Term) / 2 Equation for # of terms in an Evenly ...”
February 8, 2013
Tommy Wallach posted a reply to profit or loss in the Problem Solving forum
“You could conceivably know that this is the same as increasing by ten percent and decreasing by ten percent, which always results in a loss of ten percent (regardless of the order of increase and decrease). T”
February 8, 2013
Tommy Wallach posted a reply to Factorials: When to Divide by Another Factorial versus NOT? in the Problem Solving forum
“Hey Ostrow, Two answers: #1: yes, you''re right. We aren''t choosing two; were choosing one. So it wouldn''t make too much sense to say nine choose two! #2: with the slots method, you don''t need to think in terms of blah choose blah. That''s the joy! You''re welcome! -t”
February 8, 2013
Tommy Wallach posted a reply to Factorials: When to Divide by Another Factorial versus NOT? in the Problem Solving forum
“Hey Guys, Good talk and try, but there are a couple problems here. Let''s use the method: 1) There are 6 slots (Goalie, Forward, Forward, Midfield, Midfield, Defense) -- I fooled you on the goalie thing. There is only one goalie (it says "Only 2 kids can play the goalie position" -- ...”
February 8, 2013
Tommy Wallach posted a reply to Question in regards to the difficulty of the test over time in the Ask the Test Maker forum
“Hey Bpolley, Well, if you wanted to get really technical about it, the explanation is probably that our ability to study has improved. Before, you were on your own if you took a class; now, it''s so easy to access every question that''s ever been written, along with tons of brilliant commentary ...”
February 7, 2013
Tommy Wallach posted a reply to GMATPREP All Sentence Correction Questions in the Sentence Correction forum
“Hey BP, It''s not given away for free! We''re well-paid experts! : ) -t”
February 7, 2013
Tommy Wallach posted a reply to Factorials: When to Divide by Another Factorial versus NOT? in the Problem Solving forum
“Hey Amy, That''s the great thing about the slots method; it NEVER changes. The only weirdness comes when order only matters in certain places. Here''s an example. See if you can solve it with the slots method (and other instructors/experts, please hold off on writing up the explanation). I''ll ...”
February 7, 2013
Tommy Wallach posted a reply to Question in regards to the difficulty of the test over time in the Ask the Test Maker forum
“Thanks Rebecca, It''s a very good point. The 5-year limit is fairly explicit: GMAC doesn''t believe that test scores remain comparable for more than 5 years at a time. If you simply look at the movement of percentile scores, you can see this in action. A 99th percentile score is a 760 now, but ...”
February 7, 2013
Tommy Wallach posted a reply to GMATPREP All Sentence Correction Questions in the Sentence Correction forum
“I second everything Ceilidh said. Though all of us enjoy posting here on the forum we are all also trying to show our skills as instructors, in case people decide to go a step further in their study plan and take a class. To that end, it would feel a little sad to have everything decocted down to a ...”
February 7, 2013
Tommy Wallach posted a reply to profit or loss in the Problem Solving forum
“Heyo, Iceman is absolutely right. The answer is 1%. My explanation has been edited (I originally wrote 9.9 instead of 9.09, as I meant). I still prefer plugging in a small number to a big number, as long as you know what 1/11th and 1/9th look like as decimals. : ) -t”
February 7, 2013
Tommy Wallach posted a reply to GMATPREP All Sentence Correction Questions in the Sentence Correction forum
“Hey BP, Sounds like a pretty cool idea, but I''m not sure if it''s okayable. First of all, it would be an enormous, ENORMOUS post, which might be longer than is actually allowed in a post. Second of all, if you''re posting the official explanations (as opposed to your own explanations), those are ...”
February 7, 2013
Tommy Wallach posted a reply to Is numbers considered an uncountable modifier? in the Sentence Correction forum
“Hey Manim, There''s a lot of talk on here about the correct usage of "number" and "numbers," so I''d search it here on the site. As for your question, the correct descriptor for "numbers" would be "greater," not "more." I don''t love either of ...”
February 7, 2013
Tommy Wallach posted a reply to Factorials: When to Divide by Another Factorial versus NOT? in the Problem Solving forum
“Hey All, I''d like to suggest what I think is a better overall method for combination/permutations than the anagram grid. It''s called the slots method, and it works like this: 1. Find # of slots (decision points) 2. Fill in each slot with number of choices at that decision point 3. Work out ...”
February 7, 2013
Tommy Wallach posted a reply to GMAT Quant Review 2nd Ed.-Discrete Probability Example in the Problem Solving forum
“Hey Anant, Step 3 is made up of a few discrete parts. Part 1: If the individual probabilities of A and C add up to something more than 1, then A and C can''t be mutually exclusive. If they were, there''d be a 1.08 chance of getting (A or C) (because, in an OR situation, you always add up the ...”
February 7, 2013
Tommy Wallach posted a reply to profit or loss in the Problem Solving forum
“Hey Robin, On a question like this, you''d likely be able to use logic/answer choices to get at shortcuts. Often the GMAT gives questions where the shortcuts are so efficient that you shouldn''t do the math. However, the math here should be pretty easy, if you know your fraction/percent ...”
February 7, 2013
Tommy Wallach posted a reply to RC - Organization of the passage - komatiites in the Reading Comprehension forum
“Hey Guys, Great discussion here. I''ll chime in and take it apart a bit: Main Idea: Komatiites'' discovery Paragraph 1: Description of Kamtiites Paragraph 2: Description/ramifications of discovery (A) There are not two divergent views of a phenomenon. The only major phenomenon here is ...”
February 7, 2013
Tommy Wallach posted a reply to Line equidistant from two points in the Problem Solving forum
“Hey Guys, Jmb is absolutely right here. A line can''t be equidistant from two points. It isn''t actually possible. Some people are solving this question: "What is the slope of the line that goes through the origin and the midpoint of line segment PQ, where P = (1,11) and Q = (7,7). But ...”
February 7, 2013
Tommy Wallach posted a reply to As X as construction in the Sentence Correction forum
“Hey Prat, (D) actually carries the same meaning as (E). Or, better put, we don''t know if it does. It''s like this example I''ve used before: I love you more than Justin Bieber. Does that sentence mean "I love you more than Justin Bieber does"? Or "I love you more than I love ...”
February 6, 2013
Tommy Wallach posted a reply to :( in the Sentence Correction forum
“Hey IceMan, Thanks for the note. Indeed, I''m aware of absolute modifiers, but I didn''t like this question because usually the added detail isn''t quite so random. It tends to be a focusing detail. Of course, if this is an official GMAT question, then they''re allowing it. Luckily for us, (B) is ...”
February 6, 2013
Tommy Wallach posted a reply to Help with preparation in the GMAT Strategy forum
“Great Advice from Vom, I''m obviously a big fan of our books, having been involved with them for a good long time. But I always say that a dedicated student can see massive improvement if they work hard and use the books by any reputable company. The issue is not to see improvement as some ...”
February 6, 2013
Tommy Wallach posted a reply to Native Americans in the Sentence Correction forum
“Hey Duong, Sorry, but I''m not quite sure what it is you don''t understand. What I''m saying is that participles shouldn''t precede the noun they modify, except at the beginning of the sentence. In (D), the participle "having" is meant to modify "Native Americans," which ...”
February 6, 2013
Tommy Wallach posted a reply to Raincoats and umbrellas in the Problem Solving forum
“Whoa! Is this supposed to be a GMAT question, or to somehow help with GMAT skills? Just to be super-clear, it is not, and does not! The problem with unrealistic GMAT question is that they might send your studies off in weird directions. Worse than that, you might actively develop bad habits. For ...”
February 6, 2013
Tommy Wallach posted a reply to How do I work with Scores like Q:52 V:50 etc.? in the GMAT Strategy forum
“Hey Art, You''re not making much sense. If you have a 780 or 790, you don''t need to improve your score. You''re already close to perfect. No school in the universe will differentiate between a 780 and an 800 (which is perfect). And I''m not sure what you mean by accusing anyone on here of being ...”
February 6, 2013
Tommy Wallach posted a reply to Retailers and Web sites (which vs that) in the Sentence Correction forum
“(A) Parallelism broken on "which pay...and may be shipping" (B) "That" is incorrect, because this is a non-essential modifier. We''re not trying to describe a specific type of small retailer/web site (i.e. the type that pay regular mail rates and ship from one location). We''re ...”
February 5, 2013
Tommy Wallach posted a reply to :( in the Sentence Correction forum
“Hey Guys, I don''t see the modifier in (B) being okay, sorry to say. Consider this example: I found my umbrella yesterday, its handle made of bone. I don''t see that being okay. Is this a real question? What is the source? -t”
February 5, 2013
Tommy Wallach posted a reply to Ex: Logitech in the Sentence Correction forum
“Hey Guys, Quick correction. D is out because of the bad "it". So just B and E are correct. -t”
February 5, 2013
Tommy Wallach posted a reply to Hard 800 problem in the Problem Solving forum
“Hey Lime, Questions like this are a little dangerous on the GMAT, because they encourage you to worry about things that, if you worried about them on the real test, would be an enormous waste of time. If you were doing this on the GMAT, you''d simply try the first few x values, and extrapolate ...”
February 5, 2013
Tommy Wallach posted a reply to A conundrum in the Problem Solving forum
“Hey All, I''d also like to add something, if I could. I notice so many questions on here with bad grammar in them. I''d like everyone reading this to try to turn over this new leaf: If you notice a question with broken grammar, DON''T DO IT! The bad grammar is proof that the person who wrote it ...”
February 5, 2013
Tommy Wallach posted a reply to Manhattan's guides for beating the GMAT in the GMAT Strategy forum
“Everything vomhorizon said is true! Thanks for helping out answering that question! : ) -t”
February 5, 2013
“Hey Patanjali, Overall, I don''t like to worry about the minutiae of very wrong answer choices anyway. But your issue is just an idiom. However, I''m worried by your contention that "to be" suggests future thoughts. Not at all! "To be" is simply the infinitive of ...”
February 5, 2013
Tommy Wallach posted a reply to A fresh tricky TA dataset on weighted average in the GMAT Integrated Reasoning forum
“Ron probably wrote it. He''s a boss. : ) -t”
February 5, 2013
Tommy Wallach posted a reply to Ex: Logitech in the Sentence Correction forum
“Hey All The GMAT will not create options like B or D, and thus this question isn''t fair. The idea that the original answer choice contains the fundamental meaning is not supported by any real questions that I know of. The meaning that triumphs is always the only one that makes sense. But there ...”
February 5, 2013
Tommy Wallach posted a reply to How do I work with Scores like Q:52 V:50 etc.? in the GMAT Strategy forum
“Hey Art, You say you don''t want long explanations, but the algorithm is complicated. There is no simple explanation. The number of questions you get right and wrong does not determine your score on the GMAT (everyone from a 500-650 gets about the same number of questions right). A 51 is the ...”
February 5, 2013
Anurag@Gurome posted a reply to Another 800 problem in the Problem Solving forum
“If x is not an integer, (x^2 + x + 1) also will not be integer. Now, if x is an integer, (x^2 + x + 1) = x(x + 1) + 1 = Product of two consecutive integers + 1 As product of two consecutive integers is always even, (x^2 + x + 1) will be odd. Hence, if (x^2 + x + 1) is a multiple of 5 it must be ...”
February 5, 2013
Anurag@Gurome posted a reply to Tough problem in the Problem Solving forum
“Method 2: Any perfect square can be written in the form (a + b)^2 = (a^2 + 2ab + b^2) Hence, we''ll try to write (2^2 + 2^5 + 2^n) in such manner. Now, if we take a^2 = 2^2 and 2ab = 2^5, then b = 2^3 = 8 Hence, (2^2 + 2*2*8 + 8^2) = (2 + 8)^2 = 10^2 Hence, 2^n = 8^2 = 2^6 Hence, n = 6 ...”
February 5, 2013
Anurag@Gurome posted a reply to Tough problem in the Problem Solving forum
“Method 1: (2^2 + 2^5 + 2^n) = (4 + 32 + 2^n) = (36 + 2^n) Note that (36 + 2^n) being a multiple of 2, cannot be a perfect square of an odd integer. Hence, if it is a perfect square, it must be a square of an even integer. Say, the even integer is 2m. So, (36 + 2^n) = (2m)^2 --> 2^n = ...”
February 5, 2013
Anurag@Gurome posted a reply to 800+ problem in the Problem Solving forum
“2013 = 3*11*61 Hence, 2013^2013 = (3*11*61)^(3*11*61) = C1 + 3C2 + 3C3 = 3 + 6 + 1 = 10 2012 = (2^2)*503 The situation similar to the previous one, but now we have two identical factors. Hence, number of pairs of x and y will be exactly half of the previous one, i.e. 10/2 = 5”
February 5, 2013
Anurag@Gurome posted a reply to Some good examples to Exponents Questions in the Problem Solving forum
“Question Number : 3 # 3*((a^2)^3) - 2*((a^3)^2) - (a^5) = 3*(a^6) - 2*(a^6) - a^5 = a^6 - a^5 The correct answer is C.”
February 5, 2013
Anurag@Gurome posted a reply to Some good examples to Exponents Questions in the Problem Solving forum
“Question Number : 2 a^(y - x) = a^(-(x - y) = 1/The correct answer is C.”
February 5, 2013
Anurag@Gurome posted a reply to Some good examples to Exponents Questions in the Problem Solving forum
“Question Number : 1 y = 2^x Now, 2^(x + 3) = (2^x)*(2^3) = 8*(2^x) = 8y The correct answer is E.”
February 5, 2013
Tommy Wallach posted a reply to Nice one : Hailed as a key discovery in the Sentence Correction forum
“Hey Himu, I think we can actually do this question without even worrying about that distinction. (A) Great. (B) It doesn''t provide fossils. That makes no sense. (C) The fossils don''t resemble a fish and a land-animal, the creature does (a fossil looks like a dirty rock!). (D) SV ...”
February 5, 2013
Tommy Wallach posted a reply to Native Americans in the Sentence Correction forum
“Hey All, Lots of great work here. I think you hit all the big issues, but everybody likes a good wrap-up post! (A) "intimately knowing" is a weird use of the participle, because it generally implies something temporary/present, rather than something that was inherently and ...”
February 5, 2013
Tommy Wallach posted a reply to inlet and outlet pipe problem in the Problem Solving forum
“Hey Hemant, I didn''t mean to criticize you about grammar; the big issue is that I don''t think you should be practicing with questions that have grammatical errors in them. It''s simply bad practice, as grammar is so big on the GMAT. There are PLENTY of great sources that won''t have these ...”
February 5, 2013
Tommy Wallach posted a reply to As X as construction in the Sentence Correction forum
“(B) This question revolves around a meaning issue. In this answer choice, it''s painting, video, and photography that are varied. But that''s the wrong meaning. The variation is simply in the genres themselves; painting, video, and photography are quite varied genres. How do we know this? The idea ...”
February 5, 2013
Tommy Wallach posted a reply to that vs which in the Sentence Correction forum
“Hey Mparakala, Two reasons to prefer (E) over (A). Reason #1: (A) "The reason...is because..." (B) "The reason...is that..." Answer choice (A) is redundant. "Because" literally means "for the reason that". You wouldn''t say "The reason ...”
February 5, 2013
Tommy Wallach posted a reply to Nice one : Hailed as a key discovery in the Sentence Correction forum
“Hey Guys, Great explanations here! I would only add that the issue with (C) is that it''s not the large scaly creature that provides evidence of the link; it''s the fossil. Technically, the opening modifier could modify the large scaly creature, if that large scaly creature were alive and in ...”
February 4, 2013
Tommy Wallach posted a reply to Nice one : Hailed as a key discovery in the Sentence Correction forum
“Hey Guys, Great explanations here! I would only add that the issue with (C) is that it''s not the large scaly creature that provides evidence of the link; it''s the fossil. Technically, the opening modifier could modify the large scaly creature, if that large scaly creature were alive and in ...”
February 4, 2013
Tommy Wallach posted a reply to Pronoun singular/plural in the Sentence Correction forum
“Hey All, Good explanations from Gughan. Just to go one by one. Who is the "their"? It''s the Portuguese people, but they need to have been mentioned in the sentence if they want to be referred to by this pronoun! "Its" refers to Portuguese. But the language ...”
February 4, 2013
Tommy Wallach posted a reply to Yet VS But also VS Nevertheless Vs However in the Sentence Correction forum
“Hey Guys, First of all, please try to put only one question in each thread. I know it''s annoying, but it makes everything so much clearer for everyone else. 1) This is pretty much great. The meaning is bad however, because a doctor isn''t expected to be kind. 2) Who cares? The GMAT ...”
February 4, 2013
Tommy Wallach posted a reply to Claude Debussy in the Sentence Correction forum
“Hey All, HerrGrau has explained this one very well. We have to choose whether to put "their" on all three items in the list, or only the first one. This is a common construction in English. For example: Correct: I have gone to the store, purchased a monkey, and come home. Incorrect: ...”
February 4, 2013
Tommy Wallach posted a reply to inlet and outlet pipe problem in the Problem Solving forum
“Hey Hemant, Could you please publish the source of these questions you post? I ask because there are so many weird grammatical issues here it''s tough to translate. However: Let''s set the capacity of the tank to 300 (arbitrarily). Then we can use R*T*Workers=Work to make equations x ...”
February 4, 2013
Tommy Wallach posted a reply to Help with preparation in the GMAT Strategy forum
“Hey Harsh, We get a lot of questions like this one on the forum. The first thing you could do is simply browse through this strategy section and see everything that''s been posted. However, I want to make clear that getting better on the GMAT involves first learning fundamentals (by reading books ...”
February 4, 2013
Tommy Wallach posted a reply to Wasteful use of resources in the Sentence Correction forum
“Hey HerrGrau, Honestly, I don''t imagine there will ever be an "if...should" construction on the real GMAT. Keep in mind, this sentence is not really and "if...should" construction. This is not a conditional "if". This "if" is part of an idiom that ...”
February 4, 2013
Tommy Wallach posted a reply to Wasteful use of resources in the Sentence Correction forum
“Hey HerrGrau, Honestly, I don''t imagine there will ever be an "if...should" construction on the real GMAT. Keep in mind, this sentence is not really and "if...should" construction. This is not a conditional "if". This "if" is part of an idiom that ...”
February 4, 2013
Anurag@Gurome posted a reply to Mean, Standard deviation in the Problem Solving forum
“Say, mean score = M and standard deviation = D Hence, 58 = M - 2S and 98 = M + 3S So, (M + 3S) - (M - 2S) = 98 - 58 --> 5S = 40 --> S = 8 Hence, M = (58 + 2S) = (58 + 2*8) = (58 + 16) = 74 The correct answer is A.”
February 4, 2013
Tommy Wallach posted a reply to Question in regards to the difficulty of the test over time in the Ask the Test Maker forum
“Hey Guys, My experience is that paper tests do not remotely simulate the real test and its difficulty. An adaptive test is, by definition, harder than a paper test, once you are scoring above a certain level. Paper Test: A combination of easy, medium, and hard questions. Adaptive Test for ...”
February 3, 2013
Tommy Wallach posted a reply to stuck on v34. what to do.? in the GMAT Verbal & Essays forum
“Hey Silver Lining, Taking practice tests will get the difficulty at the place it needs to be. You don''t need to actively go out of your way to try questions of all difficulties. The test is adaptive, so it more or less hangs out where you belong. If you''re particularly bad at one category, then ...”
February 3, 2013
Tommy Wallach posted a reply to Wasteful use of resources in the Sentence Correction forum
“HerrGrau, Please do not copy information from other websites. You can provide the link if you want, but don''t paste. It''s confusing, and you have to realize that there are different grammar styles (Google''s grammar rules, for example, don''t match up with the GMAT in certain ways). Also you ...”
February 3, 2013
Tommy Wallach posted a reply to Veritas SC Question in the Sentence Correction forum
“Hey Heymant, "Matched by" is for comparisons. "Matched with" is for things like dating ("I was matched with her for the closing ceremony". And Sana, that''s not quite right. Your sentence example doesn''t make sense. You''re right that you use it for people, but ...”
February 3, 2013
Tommy Wallach posted a reply to Machine A and Machine B - Problem Solving in the Problem Solving forum
“Hey Chiccufrazer, Actually this would certainly be considered a hard question (7-800). Most GMAT explanations look very straightforward in retrospect, but both plugging in and algebra here are pretty time-consuming, with lots of steps where one could make a mistake. -t”
February 3, 2013
Tommy Wallach posted a reply to tricky SC question (1000sc) in the Sentence Correction forum
“Hey Guys, Just to explain the grammar of Challenger''s great explanation a little more, and to correct a couple things: (B) The reason you can "ignore" "who" onwards is because it''s a modifier of graduates. That means this sentence suddenly lacks an infinitive to go ...”
February 2, 2013
Tommy Wallach posted a reply to stuck on v34. what to do.? in the GMAT Verbal & Essays forum
“Hey Silver Lining, So a few things worth noting. As you probably know, your timing is still a major problem. On your most recent test, you were running ten minutes behind by question 10. You then had to rush here and there to catch up, and guess on the last three questions. Make sure you''re ...”
February 2, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Hey Bpolley, I think we''re both getting distracted from our GMAT work here! I''m out! But seriously, it''s been a fun conversation. I do think you''re very wrong, and I imagine you think I''m very wrong. Only time will tell. I will, of course, expect you to send me your entire financial ...”
February 2, 2013
Tommy Wallach posted a reply to The spacing of the four holes on a fragment of a bone flute in the Critical Reasoning forum
“Hey Mparakala, This is why it''s so important to focus on the core of the argument, as David has shown. It''ll keep you from picking something that is shallowly tempting. Think what would happen if you negated answer choice D: Flutes are not the simplest wind instrument that can be constructed to ...”
February 2, 2013
Tommy Wallach posted a reply to A man travels from one city to another city that is 'd' mile in the Problem Solving forum
“Hey Vinni, You''re right that he gets there three hours late. However, the method described by Hemant is setting that "three hours later" as right on time. Then, he is calculating what the time would be for "four hours early" from that new benchmark. If you really wanted ...”
February 2, 2013
Tommy Wallach posted a reply to Veritas SC Question in the Sentence Correction forum
“Hey Guys, This is just an idiom, which means there''s no logic to it other than it''s just how English is spoken! The idiom is "only matched by". The order is unimportant: X is only matched by Y. X is matched only by Y. It simply means "the only thing that is as ...”
February 2, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Hey Bpolley, Good points all. And you''re right, self-serving bias is a bias! (Though it seems to more perfectly describe someone who believes their innate intelligence will allow them to beat the odds than someone who points out how unlikely that is!). : ) And indeed, only time will tell. ...”
February 1, 2013
Tommy Wallach posted a reply to Nature of language and the process in the Sentence Correction forum
“Hey Amysky, Uh...where is this question from? I don''t like it! : ) We start with a subject-verb agreement issue. "Research" is the subject of the sentence. It''s singular, so we need "has revealed," not "have revealed". That kills off B, D, and E. At this ...”
February 1, 2013
Tommy Wallach posted a reply to Financial Officers---Tough one! Experts help plzz in the Sentence Correction forum
“Hey Amysky, This is a rare version of the COMMAND subjunctive with the idiom "on condition." First, let''s look at some more common subjunctives: I demand that you buy dinner. I request that you eat lunch. I require that you play golf. In these three examples, the verbs ...”
February 1, 2013
Tommy Wallach posted a reply to spraying pesticides in the Sentence Correction forum
“Great take on this from HerrGrau, One quick thing: Where is this question from? I ask only because usually the GMAT doesn''t like to parallel clauses to non clauses. Unfortunately we don''t have a choice here: (B) accidents, weather conditions that cannot be foreseen, and pilot errors (D) ...”
February 1, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Oh, and here''s a professor at NYU Stern, just for the fun of it, providing data on the success of value-based investors: http://people.stern.nyu.edu/adamodar/pdfiles/country/OmahaValueInvesting.pdf Not great. : ) -t”
February 1, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Hey Bpolley, Well, you''re not addressing any of my actual points. All I''ll say is imagine this scenario: 1) I decide to start throwing a basketball underhand, granny style. 2) I make ten shots in a row. 3) I see YouTube videos of 100 people making shots granny style. 4) I decide: ...”
February 1, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Oh, and to your other issue: 1) Daniel Kahneman won the Nobel Prize in Economics. So he is no slouch. 2) Warren Buffet is an amazing investor, for a whole host of reasons. I love the guy. But again, if tens of thousands of people are employing a strategy that is effectively random (yep, I said ...”
February 1, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Hey Bpolley, Well, I realize I''m not going to convince you. That is the power of dogma. What I can tell you is that the Buffet article is, as you know, a classic in the field, but it doesn''t actually say much of anything. He simply points to some anecdotal evidence. But that doesn''t prove ...”
February 1, 2013
Tommy Wallach posted a reply to Challenge#1 (Modulus/Absolute Value) in the Data Sufficiency forum
“Hey Guys, Just wanna give Aneet a shout-out here. This is a great question, absolutely realistic. What everyone should notice (particularly you, Hemanth!), is that if a GMAT question looks too good to be true, it probably is! In other words, if you solve this without noticing something a little ...”
February 1, 2013
Tommy Wallach posted a reply to Manhattan free GMAT test essay- Please grade in the GMAT Essays (AWA) forum
“Hey What''s in the Store, This essay starts out strong, then runs into problems. Basically, you have one great example here, then you repeat it in your third paragraph, then you don''t say much of anything in your fourth paragraph. You can maybe get away with only having two solid examples. But ...”
February 1, 2013
Tommy Wallach posted a reply to Coronary Patients in the Sentence Correction forum
“Hey Guys, HerrGrau did a pretty good job with this one, but just to mention a few other quick things. The only way I can think of correctly using "half" in a comparison, as many of these answer choices do, is to use "that": "I have less than half the chance of dying ...”
February 1, 2013
Tommy Wallach posted a reply to comma+which, learn from og questions in the Sentence Correction forum
“Hey Guys, First thing, HerrGrau is not correct that the GMAT will not be testing commas before which/that. It is a hard and fast rule that one must use a comma before which (all relative/non-essential modifiers), and never before that. And these rules will get broken, and thus tested. Beyond ...”
February 1, 2013
Tommy Wallach posted a reply to Wasteful use of resources in the Sentence Correction forum
“Hey Sana, You''re thinking of the usage of "should" with subjunctive command phrases. Never do that: I demand that you should go to the store. I request that you should buy me lunch. But you are welcome to use "should" with "if." Consider the Lord''s Prayer: ...”
February 1, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“All I will add is this: beating the market without insider information is a pipe dream. http://www.investopedia.com/articles/trading/10/beat-the-market.asp#axzz2Jg711ody It doesn''t happen. Ever. When it does, it''s because, statistically, if tens of thousands of people are investing ...”
February 1, 2013
Tommy Wallach posted a reply to Cards in deck in the Data Sufficiency forum
“Hey Soumita, When you post a question, it might help to explain the logic you used to get to your answer. In this case, you seem to be assuming that: The odd cards are red = only the odd cards are red But those aren''t the same thing. Statement 1 merely tells you that all the odd-numbered ...”
February 1, 2013
Tommy Wallach posted a reply to Question in regards to the difficulty of the test over time in the Ask the Test Maker forum
“Hey bpolley, Technically, the top 10% remain the top 10% in the eyes of admissions departments. It''s really no different as a relative comparison now than then. Sorry! : ) -t”
February 1, 2013
Tommy Wallach posted a reply to stuck on v34. what to do.? in the GMAT Verbal & Essays forum
“Hey Silver Lining, So the short answer is that you didn''t really provide the correct answers to any of my questions. That shows me that there''s still a lot of very straightforward work ahead. You need to get a set of books (from my company or another), or else take a class. That''s my honest ...”
January 31, 2013
Tommy Wallach posted a reply to Subjunctive mood question in the Sentence Correction forum
“Hey Aolas, The answer to your question may not be satisfying, but it''s what it is. The command subjunctive is formed in a very specific way: you take the infinitive form of the verb and remove the "to". You do not use ANY other words (be, should, etc.). I demand that you come ...”
January 31, 2013
Tommy Wallach posted a reply to Manhattan Inequalities Chapter 12, DS Problem 12 in the Data Sufficiency forum
“Hey jr, vkb is exactly right here. It''s always important to understand why a given rule is a rule. The reason you''re not supposed to multiply by a variable if you don''t it''s sign is that, whenever you multiply both sides of an inequality by a negative number, the sign flips. So, just as vkb ...”
January 31, 2013
Tommy Wallach posted a reply to stuck on v34. what to do.? in the GMAT Verbal & Essays forum
“Hey Silver Lining, There''s no better commentary on your studying technique then seeing a bunch of practice tests without a change. HOWEVER, if you''ve taken them fairly close together, you might be setting your expectations too high. That being said, I''m going to continue assuming that ...”
January 30, 2013
Tommy Wallach posted a reply to Assumption question in the Critical Reasoning forum
“Hey Charu, I have doubts about this question. Let''s start by looking at the conclusion/premise: Conclusion: Today''s flightless birds developed their feathers to manage body temp Premise: Ancient reptiles developed their feathers to manage body temp, and many couldn''t fly The argument ...”
January 30, 2013
Tommy Wallach posted a reply to Since at least 1868, paleontologists have been arguing over in the Critical Reasoning forum
“Hey Varun, Great question here. Let''s start by looking at the conclusion/premise: Conclusion: Dinosaurs = ancestors of birds Premise: Tons of features in common At first glance, this is a great argument. So really we simply need an assumption that strengthens the link between features ...”
January 30, 2013
Tommy Wallach posted a reply to Udane is planning a trip between the cities of Bilbao and in the Data Sufficiency forum
“Hey Udane, Cool idea for a question, but it seems funky. Just looking at it, we don''t know how long it takes to get to the airport, so how could we possibly compare? If we were to assume he STARTED at the airport/train station, that would be different. But statement 2 tells us that he has to ...”
January 30, 2013
Tommy Wallach posted a reply to The industrial pollutants known as PCB’s were first in the Sentence Correction forum
“Hey Guys, I can take this on in a bit more detail. The big issue is that we NEED the word "that" after show, because it''s introducing a clause (phrase with a verb in it). So that gets us to (A) right away. More stuff.: B) parallel broken between "to have entered" ...”
January 29, 2013
Tommy Wallach posted a reply to Cars and Trucks in the Sentence Correction forum
“Hey Guys, One quick thing on the idiom here. "Alone" doesn''t mean "by itself." That''s the other version of alone: "I came here alone." "Alone" actually means "just". Man cannot live by bread alone = Man cannot live on just bread. This ...”
January 29, 2013
Tommy Wallach posted a reply to Annual stockholders meeting in the Sentence Correction forum
“Hey Guys, First thing: parallelism here is FINE, in all 5 answer choices. "threat" is a noun, as is "declining sales," so they parallel just fine. Now, to take the rest apart: "Including among them" is redundant. "Sales" and "threat" are ...”
January 29, 2013
Tommy Wallach posted a reply to SC_Comparison in the Sentence Correction forum
“Hey Ice-rush, Be careful, this sentence isn''t strictly about the usage of "as". You are allowed to use "as" without a verb: He’s not as tall as his brother. That is a correct sentence. You do not have to say: "He''s not as tall as his brother is." The ...”
January 29, 2013
Tommy Wallach posted a reply to Placement of words in the Sentence Correction forum
“Hey Guys, I would argue that--Hastily, the senator read her speech--is wrong. Hastily is modifying the verb, and because it isn''t a full phrase (deserving separation with a comma: "In the beginning, there was nothing."), there''s no reason to write it like this. However, I don''t ...”
January 29, 2013
Tommy Wallach posted a reply to Labor market - level 600 in the Sentence Correction forum
“During the past decade, the labor market in France has not been operating according to free market principles, but instead stifling functioning through its various government regulations restricting the hiring and firing of workers. a) principles, but instead stifling functioning through its ...”
January 29, 2013
Tommy Wallach posted a reply to Scotland Salmon in the Sentence Correction forum
“Hey Guys, Great explanation from BP here, but due to the ickiness of this question, I wanted to weigh in: A) As was said, "number" is the subject here. Also, the use of "because" is incorrect. You wouldn''t say, "My head was chopped off because of that axe." ...”
January 29, 2013
Tommy Wallach posted a reply to OG 12 - 41 (would) in the Sentence Correction forum
“Hey Djay, You pretty much nailed the list right there. A perennial favorite is the use of "were" with "if": If the company were more successful, they wouldn''t be quite so maneuverable. And you pointed out the "I wish" form: I wish I were a tumbleweed, going ...”
January 29, 2013
Tommy Wallach posted a reply to Graphical representation IR. Need help on one question. in the GMAT Integrated Reasoning forum
“Hey rtad05, Well, obviously any dot in the first quadrant goes in (because those represent a raise/raise). Any dot in the third quadrant is obviously out (because those represent a loss/loss). The tough part is quadrant two and quadrant four. Anytime the raise is obviously more than the loss, ...”
January 29, 2013
Tommy Wallach posted a reply to Ratio in the Data Sufficiency forum
“Hey Soumita, Where are you getting this question from? Indeed, your complaint is legitimate. The question would need to specify that there are only brown and blue cars in the lot for Statement 2 to be sufficient. OR, double-check that you copied the question down word for word. Even a little ...”
January 29, 2013
Tommy Wallach posted a reply to Improved technology and equipment often result in fewer inju in the Critical Reasoning forum
“Hey Buzz, In order to distinguish between A and C, you need to compare two sentences in the stimulus: 1) Improved technology and equipment often result in fewer injuries during high-risk activities such as rock climbing and scuba diving. 2) People who are poorly trained in these activities ...”
January 29, 2013
Tommy Wallach posted a reply to PROBLEM SOLVING in the Problem Solving forum
“Yeah, the problem with Venn diagrams is that there''s no distinct place to put a lot of the information. Think of it this way. A Venn diagram with two groups has four distinct places to put things: only in X, only in Y, in the confluence of X&Y, and outside of both circles (which is a weird ...”
January 29, 2013
Anurag@Gurome posted a reply to Rectangle or quadrilateral in the Problem Solving forum
“Any four-sided shape is a Quadrilateral. But the sides have to be straight, and it has to be 2-dimensional. A rectangle is a four-sided shape where every angle is a right angle (90°). Also opposite sides are parallel and of equal length. A square has equal sides and every angle is a right ...”
January 28, 2013
Tommy Wallach posted a reply to How did they get these factors?!? in the GMAT Strategy forum
“Hey Smills, I think you''re misinterpreting what''s going on. They''re just multiplying through. (2x - 4) and (x + 2x^2 + x^3) are factors of (- 4x - 6x^2 + 2x^4) 2x * x = 2x^2 2x * 2x^2 = 4x^3 2x * x^3 = 2x^4 -4 * x = -4x -4 * 2x^2= -8x^2 -4 * x^3 = -4x^3 That''s -4x 2x^2 - 8x^2 ...”
January 28, 2013
Tommy Wallach posted a reply to Timing Advice needed in the GMAT Strategy forum
“Hey Challenger, Indeed, the truth here is that you know what to do, and now you have to do it. I know you want much more brilliant advice than that, but there isn''t much to say. I always tell my students there are two things that are REALLY hard for an instructor to fix: 1) stupid mistakes and ...”
January 27, 2013
Tommy Wallach posted a reply to Experts-need info on books selection in the GMAT Strategy forum
“Hey Guys, Here''s what I know. We''re a great company. Veritas is a great company. Kaplan is a great company. Obviously, I know our books very well, and I don''t know the others half as well. But I have faith that any serious, dedicated student will be able to get what they need from the books of ...”
January 27, 2013
Tommy Wallach posted a reply to Political Science Courses_CR in the Critical Reasoning forum
“Hey Rajat, Just remember, on the GMAT, you really aren''t allowed to make any assumptions. Ambition and motivation, by definition, make people more successful. Math classes/current affairs do NOT make people more successful. In fact, even if you think those classes are harder (and thus somehow ...”
January 27, 2013
Tommy Wallach posted a reply to Help! in the Sentence Correction forum
“Hey Sana, Nobody can give you good advice until you let us know what you''re scoring on practice tests. If your quant score is a 35, then there''s no point in using the advanced quant book (yet!). If your score is higher, you could start looking at that book. HOWEVER, if your quant is already ...”
January 27, 2013
Tommy Wallach posted a reply to 570 Q31/V37 on the GMAT in the I just Beat The GMAT! forum
“Hey Chicki, The safest thing would be to talk to the admissions department of the school(s) you''re applying to, or else see if their literature says anything about average score of incoming students. Don''t try to guess this, or average out from other schools. The safest bet is to have a hard ...”
January 27, 2013
Tommy Wallach posted a reply to A fresh tricky TA dataset on weighted average in the GMAT Integrated Reasoning forum
“Hey E-Gmat, I know you post a lot of stuff on here, but as a caring citizen of the Beat the GMAT, I have to ask that you please make sure your material is written correctly, and that it presents a realistic take on the test. Your original question has numerous grammatical errors. ...”
January 27, 2013
Tommy Wallach posted a reply to Help! in the Sentence Correction forum
“Hey Sana, Unfortunately, this is a bit too general of an issue for me to give any helpful advice to. If you want to take a Manhattan practice test, then I could look at it and give you more specific advice. -t”
January 27, 2013
Tommy Wallach posted a reply to railway journey in the Problem Solving forum
“Hey Hemant, No problem at all, but yes, in the future, it''s best not to post anything here that isn''t at least intended to be a GMAT question. Even though the question you posted tests concepts that are on the GMAT (rates, ratios, etc.), the GMAT really doesn''t focus so heavily on calculation. ...”
January 27, 2013
Tommy Wallach posted a reply to Help! in the Sentence Correction forum
“Hey Sana Noor, So I looked it up, and that seems like a pretty cut-rate book. I always try to tell people: for practice questions, stick to the OGs (13th edition, and the 2nd edition Verbal + Quant guides) and the strategy guides from one of the major, reputable companies. That is enough material ...”
January 27, 2013
Tommy Wallach posted a reply to 700+ Rainforests in the Sentence Correction forum
“Hey Challenger, I understand what your point is, and I''ll respond to it in just one post! : ) The original sentence said: "more than half of the world''s plant and animal species, and absorb" As has been noted by others, that final "and" doesn''t need a comma before it. ...”
January 27, 2013
Tommy Wallach posted a reply to OG#12, Que 52 in the Sentence Correction forum
“Though indeed this question has been explained elsewhere, we might as well have the solution on this thread, seeing as this thread exists! To Josephine Baker, Paris was her home long before it was fashionable to be an expatriate, and she remained in France during the Second World War as a ...”
January 27, 2013
Tommy Wallach posted a reply to railway journey in the Problem Solving forum
“Hey Hemant, First step. Before posting a question, please make sure there are no typos or errors. Even a couple missing words can make a question mega-confusing for folks, and I see a couple errors here. Also, this is not remotely a realistic question. There are no questions on the GMAT that ...”
January 27, 2013
Tommy Wallach posted a reply to Help! in the Sentence Correction forum
“Hey Patanjali, Where is this question from? It''s majorly icky. a. among hunter-gatherer societies, and those that have persisted b. among hunter-gatherer societies, and those persisting c. among hunter-gatherer societies, and that those persisting d. between hunter-gatherer societies, ...”
January 27, 2013
Tommy Wallach posted a reply to Medium Difficulty Exponents/variables in the Data Sufficiency forum
“Hey Srisus, Whether you''re right or wrong, we like to avoid any mention of logarithms on the GMAT, because they''re never tested at all, so a lot of people won''t know what the heck you''re talking about! Occasionally you''ll do a cube root, but I don''t even think I''ve seen a root other than ...”
January 26, 2013
Tommy Wallach posted a reply to Geometry in the GMAT Math forum
“Hey BTG, That''s absolutely right! Do the follow-up steps make sense to you? -t”
January 26, 2013
Tommy Wallach posted a reply to Section 301 in the Sentence Correction forum
“Good point, Brian! I missed that one. That action thing is definitely key with the "by" construction. -t”
January 26, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Hey BPolley, I understand your annoyance BUT you are actually misunderstanding the point of the GMAT. It is VERY PURPOSELY a test of trickery, not of knowledge. Keep in mind, this stuff is important. In fact, the example you gave was wrong. If someone says, "Every division with more than ...”
January 26, 2013
Tommy Wallach posted a reply to 700+ Tax Deduction in the Sentence Correction forum
“Oy! Sorry friends. Classic misread. I gotta slow down on these posts. You''re absolutely right! You can''t change what you had been allowed; it makes no sense! Sigh. Apologies. : ) -t”
January 25, 2013
Tommy Wallach posted a reply to low score twice after a good preparation in the GMAT Strategy forum
“Hey BGV, I''m going to give you some tough love here. It sounds like you''re seeking someone on here to give you a magic bullet for improvement on the GMAT. But there''s no secret to improvement. If your practice test score is significantly off your goal score, you need to buy a set of ...”
January 25, 2013
Tommy Wallach posted a reply to Political Science Courses_CR in the Critical Reasoning forum
“Hey Soumita, You''re right that current affairs are another possible thing, but logically, an interest in current affairs doesn''t inherently explain one''s higher GPA. On the other hand, being ambitious and motivated DOES explain a higher GPA. Does that help? -t”
January 25, 2013
Tommy Wallach posted a reply to Frequencies greater than or equal to 22 kHz are inaudible in the Data Sufficiency forum
“Hey Guys, This might be super annoying, but there''s a logical defense for answer choice E. If we jump to putting the two pieces of information together, we know that Frequency F is 19 kHz. Now let''s look at the question stem. We know that any frequency greater than or equal to 22 kKz is ...”
January 25, 2013
Tommy Wallach posted a reply to One of the students VS is One of the students in the Sentence Correction forum
“Hey Nisagl, Yes, as I said in a previous post. Cool? -t”
January 25, 2013
Tommy Wallach posted a reply to One of the students VS is One of the students in the Sentence Correction forum
“Hey Nisagl, That''s not what you asked. You wrote: So you asked me how to write it. And as I said, there are many possible ways to write it. If you''d like to know about a particular sentence, please say: Is this correct: "sentence sentence sentence" That would be clearer. ...”
January 25, 2013
Tommy Wallach posted a reply to One of the students VS is One of the students in the Sentence Correction forum
“Hey Nisagl, I really like to encourage people not to make up too many hypotheticals. The situation you describe is so complicated and weird, I really wouldn''t worry about it unless you actually see something on a real practice question that gives you pause. There are an infinitude of ways to say ...”
January 25, 2013
Tommy Wallach posted a reply to Quant help in the GMAT Strategy forum
“Hey Shenoy, Lots of important advice here. 1) A practice test without test conditions is 100% useless. If there''s noise from the neighbors, stop, and reset the test. And NEVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER EVER ...”
January 25, 2013
Tommy Wallach posted a reply to One of the students VS is One of the students in the Sentence Correction forum
“Hey Nisagl, I think I already explained this, but... You can''t say "One of the students who were sick..." Why not? Because the subject of that verb is "one." You wrote "who modifies the students who were sick." No it doesn''t. "Who" modifies ...”
January 25, 2013
Tommy Wallach posted a reply to In 1990s in the Sentence Correction forum
“Hey All, Just to be sure an expert has weighed in on this. This is a ridiculous question in every way. You don''t say "In 1990''s," you say "In the 1990''s." And if you said that, you''d need a past tense verb, if this question was written after the 1990''s, or a present ...”
January 25, 2013
Tommy Wallach posted a reply to One of the students VS is One of the students in the Sentence Correction forum
“My head hurts! Guys, really try to write grammatically when talking about grammar, or life gets confusing! 1)The percentage of students who do not attend ceremony was small. --> This sentence isn''t grammatical... NEW 1): The percentage of high school students who do not go to college ...”
January 25, 2013
Tommy Wallach posted a reply to Section 301 in the Sentence Correction forum
“My take on his one is that it''s not about an idiom with "conclude," it''s an idiom with "satisfaction." Basically, you say: "This is to my satisfaction." So you also have to say: "This has concluded to my satisfaction." If we were just using ...”
January 25, 2013
Tommy Wallach posted a reply to Parallelism and modifier in the Sentence Correction forum
“Brian''s absolutely right here, as usual! : ) The word "when" can only modify actions, and thus it is purely an adverbial modifier. This means it is under no constraints in terms of its general placement in a sentence: When I was younger, I ate fish. I ate fish when I was younger. ...”
January 25, 2013
Tommy Wallach posted a reply to AWA essay to be critiqued please! in the GMAT Essays (AWA) forum
“Hey There, I agree with everything Brian said. Having a third body paragraph is always a good idea (the other big error here is that there''s no evidence this method would "end an economic downturn." It might help things, but it would it turn a negative slope into a positive one.). But ...”
January 25, 2013
Tommy Wallach posted a reply to Medium Difficulty Exponents/variables in the Data Sufficiency forum
“Hey All, Anurag is totally right on this one. For the answer to be (B), a few things would have to be different. For example: If a, b, and c are integers, and 3^a * 5^b = c, what is the value of b? (1) 5^a = 25 (2) c = 36 Now, the answer would be B, because there aren''t any 5s in the ...”
January 25, 2013
Anurag@Gurome posted a reply to Medium Difficulty Exponents/variables in the Data Sufficiency forum
“Please note that we are not given in the question that variables can only take integer values. (1) 5^a = 25 implies 5^a = (5)^2 implies a = 2, bit we do not know the value of b; NOT sufficient. (2) c = 36 implies (3)^a * (4)^b = 36 If a = 2, and b = 1, then (3)^2 * (4)^1 = 36 Since we are ...”
January 25, 2013
Anurag@Gurome posted a reply to 65 or older overlapping sets in the Data Sufficiency forum
January 25, 2013
Anurag@Gurome posted a reply to Carlos the racer in the Data Sufficiency forum
“Distance = speed * time or d = st, where d = distance, s = speed (in mph), t = time Question is: Is d > 6? or is st > 6 or is s * (1/2) > 6 implies is s > 12 mph Now convert mph to feet per sec: 12 miles per hour = (12 * 5280)/(60 * 60) = 17.6 feet per sec So, the question is: Is s ...”
January 25, 2013
Anurag@Gurome posted a reply to Probability with balls in the Data Sufficiency forum
January 25, 2013
Anurag@Gurome posted a reply to divisibility in the Data Sufficiency forum
“I have posted a solution here: http://www.beatthegmat.com/is-x-a-multiple-of-y-t85339.html”
January 25, 2013
Tommy Wallach posted a reply to The Difference between a 750 and a 650 Test Taker in the GMAT Strategy forum
“Hey Karite, Kudos! I think your new though process about the GMAT is fantastic. Set incremental goals, and try to really congratulate yourself for every new piece of material mastered. Tests are silly hoops that we have to jump through, but focusing on the negative never helped anybody. I''m ...”
January 25, 2013
Tommy Wallach posted a reply to What are the actual ranges for Q/V scaled scores? in the Ask the Test Maker forum
“Ron, only the great Oz is allowed to score above 51. Everyone knows that. -t”
January 25, 2013
Tommy Wallach posted a reply to Perimeter of a rectangle in the Problem Solving forum
“The rule you''re discussing is only for right triangles. Isosceles triangles can come in all different kinds of angle ratios (though two angles will always be equal). So if you have two lines connecting the four corners of a square or rhombus, you do know that the resultant triangles will be ...”
January 25, 2013
Tommy Wallach posted a reply to The city's decision to move the baseball stadium from its pr in the Critical Reasoning forum
“Great explanation here, Shenoy. Just for fun, I''ll throw in a few more words on the answer choices and present the official breakdown of the core: Conclusion: Desirability of downtown increases with stadium Premise: Stadium makes streets safer and helps businesses A) This is incorrect ...”
January 24, 2013
Tommy Wallach posted a reply to Quant help in the GMAT Strategy forum
“Hey Shenoy, So, first the bad news, then the good news. Bad news: Even though a month may feel like a long time, our student typically prepare for 3-4 months for the GMAT. So if you need to see massive improvement (I don''t know what your current score or your goal is), it might be a stretch. ...”
January 24, 2013
Tommy Wallach posted a reply to combination in the Problem Solving forum
“Hey Guru et. al., I see the issue, I read "How many different groups can be made?" not "How many ways can they be divided into these groups?" Pays to read the original question closely! Thanks for the correction. Crisis averted! -t”
January 24, 2013
“Hey Sinmk2, I''m not sure what your question is, so I''ll just explain what''s wrong with D+E: A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought. (D) claims, suggesting about the economy that ...”
January 24, 2013
Tommy Wallach posted a reply to GMAT Prep Test - Strange Operator Question in the Problem Solving forum
“Hey V_schame, This is a function question, like f(x) = 2x, only they made up a funny symbol to make it more confusing. All it means is that whatever two numbers go on either side of the @ symbol, you need to run them through that little program (add them together, and subtract the product). I. ...”
January 24, 2013