25 Hardest Questions on GMAT Club [List] : General GMAT Questions and Strategies

bb · 2012-12-12T15:20:36-08:00

25 Hardest Questions from the GMAT Club Forum Are you familiar with the GMAT Club's timer ? We have pulled timer results from our database and analyzed every question in the forum. Based on those results, we have compiled a list of the hardest questions in each of the question forums we have. Below I am presenting to you the top 25 questions from each. Problem Solving (PS) Rank Title Topics 1 If x is positive, which of the following could be correct Inequalities, Must be True Questions 2 In a room filled with 7 people, 4 people have exactly 1 Combinations, Probability 3 If x > y^2 > z^4, which of the following statements could be Algebra 4 In the infinite sequence A, An = X^(n-1) + X^n + X^(n+1) + X Algebra, Sequences 5 In a village of 100 households, 75 have at least one DVD Overlapping Sets 6 The water level in a rectangular swimming pool measuring 60 Geometry 7 In a certain bathtub, both the cold-water and the hot-water Work/Rate Problems 8 If x=3/4 and y=2/5, what is the value of Roots, Absolute Values/Modules 9 For how many ordered pairs (x, y) that are solutions of the Absolute Values/Modules, Inequalities 10 How many times will the digit 7 be written? Combinations 11 If equation |x/2|+|y/2| = 5 encloses a certain region Absolute Values/Modules, Coordinate Geometry 12 100 people are attending a newspaper conference. 45 of them Overlapping Sets, Min/Max Problems 13 If x is an integer and |1-x|<2 then which of the following Absolute Values/Modules, Must be True Questions 14 Which of the following represents the complete range of x Inequalities, Absolute Values/Modules 15 Coach Miller is filling out the starting lineup for his Combinations 16 If x represents the sum of all the positive three-digit Combinations 17 What is the tenth digit to the right of the decimal point Fractions/Ratios/Decimals 18 x/|x|<x. which of the following must be true about x ? Inequalities, Absolute Values/Modules 19 On average, the bottle-nosed dolphin comes up for air once Percents and Interest Problems 20 In the rectangular coordinate system shown above, which Coordinate Geometry, 21 If x/|x| |a + b| ? Inequalities, Absolute Values/Modules 25 If the sum of the consecutive integers from -42 to n Statistics and Sets Problems Data Sufficiency (DS) Rank Title Topics 1 If a, b and c are integers such that b > a, is b+c > a Inequalities 2 |x|=|2y|, what is the value of x-2y? Absolute Values/Modules, Inequalities 3 Store S sold a total of 90 copies of a certain book during Word Problems 4 If x^2 = y + 5, y = z - 2 and z = 2x, is x^3 + y^2 + z Divisibility/Multiples/Factors, Algebra 5 If t is a positive integer and r is the remainder when t^2+5 Remainders 6 Is x > 0? (1) |x + 3| = 4x Absolute Values/Modules, Inequalities 7 If zy y ? (1) x^(1/2)>y (2) x^3>y Exponents/Powers, Roots, Inequalities 9 If m and r are two numbers on a number line, what is the Absolute Values/Modules, Coordinate Geometry, 10 What is the positive integer n? , Number Properties, Divisibility/Multiples/Factors 11 If A<Y<Z<B, is |Y-A|< |Y-B|? Absolute Values/Modules, Inequalities 12 A jar contains 8 red marbles and y white marbles. If Joan Probability 13 If x is not equal to 0, is |x| less than 1? (1) x/|x|< x Absolute Values/Modules, Inequalities 14 What is the value of y? Absolute Values/Modules 15 In the xy-plane, region R consists of all the points (x, y) Inequalities, Coordinate Geometry 16 If p, x, and y are positive integers, y is odd, and p = x^2 Divisibility/Multiples/Factors, Remainders 17 Machines X and Y work at their respective constant rates Work/Rate Problems 18 In triangle ABC, point X is the midpoint of side AC and Geometry 19 If 2 different representatives are to be selected at random Probability 20 x is an integer and x raised to any odd integer is greater Exponents/Powers, Algebra 21 Is the integer n odd? (1) n is divisible by 3. (2) 2n is Divisibility/Multiples/Factors 22 If x is a positive number less than 10, is z greater than Inequalities, Absolute Values/Modules 23 If p and n are positive integers and p > n, what is the Remainders 24 If a and b are positive integers divisible by 6, is 6 the Divisibility/Multiples/Factors 25 If x and y are integer, what is the remainder when x^2 + y^2 Remainders Critical Reasoning (CR) Rank Title Topics 1 In Patton City, days are categorized as having heavy Conclusion 2 For the writers who first gave feudalism its name, the Must be True 3 Beginning in 1997, high school seniors in State Q have been Conclusion, Numbers & Percent 4 Recently, the research and development departments at major Assumption 5 Editorial:The measures taken by our government to force Assumption 6 In 1986, the city of Los Diablos had 20 days on which air Additional Evidence 7 If one of the effects of a genetic mutation makes a Must be True 8 Health Maintenance Organizations (HMOs).... Weaken, CR Resources 9 The Action-Packed Gaming Company, based on the success of Assumption 10 Some of our federal legislators are opposed to government Weaken 11 Biologists suspect that feathers are modified scales. Assumption 12 For a ten-month period, the total monthly sales of new cars Must be True 13 Doctors in Britain have long suspected that patients who Weaken, 14 In the United States, vacationers account for more than half Must be True 15 Scientists have several rival theories on the causes of Assumptions 16 All bridges built from 1950 to 1960 are in serious need of Must be True 17 Naturally occurring chemicals cannot be newly patented once Must be True 18 It is true of both men and women that those who marry as Strengthen 19 Those who oppose abortion upon demand make the foundation of Assumption 20 In a study of factors affecting employee satisfaction , Conclusion 21 In general, jobs are harder to get in times of economic Strengthen 22 The anticipated retirement of tens of thousands of baby Weaken 23 During a single hour of a pledge drive for a public radio Resolve Paradox 24 Members of the Amazonian Akabe people commonly take an Weaken 25 Certain instruments used in veterinary surgery can be made Additional Evidence, Method of Reasoning Sentence Correction (SC) Rank Title Topics 1 The manager at the office supply store believes that the new Comparisons, Parallel Structure 2 Contemporary accounts of the life of Charlemagne, crowned Parallel Structure 3 The recent spate of traffic jams on Beijing-Tibet highway Style and Usage, Subject Verb Agreement 4 Originally a trading port, Hong-Kong, currently estimated to Clauses, Modifiers 5 In some African languages, verbs not only encode the Idioms, 6 The recent floods in Pakistan were caused by an incessant Idioms, Verb Tense/Form 7 The paradox of the Roman empires history is marked by the Parallel Structure, Participle Parallelism 8 Early 16th Century moralist philosophers, particularly in Parallel Structure 9 It has been estimated that the annual cost of water and Diction, Idioms 10 In assessing the problems faced by rural migrant workers, Construction 11 The recent discovery of a red oak tree sap that is Comparisons, Modifiers, Parallel Structure 12 The new proposal will encourage larger transparency about Subject Verb Agreement 13 Regarded by opponents as ineffective and meddlesome Modifiers 14 Supporters of tax breaks that local governments award to Pronouns 15 Beatrix Potter, in her book illustrations, carefully Modifiers 16 Out of the publc's interest in the details of and conflicts Subject Verb Agreement 17 Any medical test will sometimes fail to detect a condition Pronouns, Gramatical Construction 18 Hoping the customers would not carelessly throw too many of Pronouns 19 Recently documented examples of neurogenesis, the production Parallel Structure 20 Scientists calculated that the asteroid, traveling at 46,000 Subject Verb Agreement 21 Deliberately imitating the technique of Louis Armstrong, Modifiers 22 Out of the public's interest in the details of and conflicts Subject Verb Agreement 23 The states three problem areas have seen a gradual decrease Verb Tense/Form, Which/That 24 In good years, the patchwork of green fields that surround Subject Verb Agreement 25 The computer company's present troubles are a result of Modifiers, Construction Methodology & how we determined difficulty: We have taken all of the timer results and discarded any results that involved more than 5 mins total time. Then we took the average time it took to answer the question and multiplied it times the percentage of incorrect answers. There are a few assumptions we are making here and results may not be perfect in every individual case, but in an overall picture, this should be a very useful tool for you. We welcome your suggestions for this and other resources.

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25 Hardest Questions on GMAT Club [List]

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Problem Solving (PS)
Rank	Title	Topics
1	If x is positive, which of the following could be correct	Inequalities, Must be True Questions
2	In a room filled with 7 people, 4 people have exactly 1	Combinations, Probability
3	If x > y^2 > z^4, which of the following statements could be	Algebra
4	In the infinite sequence A, An = X^(n-1) + X^n + X^(n+1) + X	Algebra, Sequences
5	In a village of 100 households, 75 have at least one DVD	Overlapping Sets
6	The water level in a rectangular swimming pool measuring 60	Geometry
7	In a certain bathtub, both the cold-water and the hot-water	Work/Rate Problems
8	If x=3/4 and y=2/5, what is the value of	Roots, Absolute Values/Modules
9	For how many ordered pairs (x, y) that are solutions of the	Absolute Values/Modules, Inequalities
10	How many times will the digit 7 be written?	Combinations
11	If equation \|x/2\|+\|y/2\| = 5 encloses a certain region	Absolute Values/Modules, Coordinate Geometry
12	100 people are attending a newspaper conference. 45 of them	Overlapping Sets, Min/Max Problems
13	If x is an integer and \|1-x\|<2 then which of the following	Absolute Values/Modules, Must be True Questions
14	Which of the following represents the complete range of x	Inequalities, Absolute Values/Modules
15	Coach Miller is filling out the starting lineup for his	Combinations
16	If x represents the sum of all the positive three-digit	Combinations
17	What is the tenth digit to the right of the decimal point	Fractions/Ratios/Decimals
18	x/\|x\|<x. which of the following must be true about x ?	Inequalities, Absolute Values/Modules
19	On average, the bottle-nosed dolphin comes up for air once	Percents and Interest Problems
20	In the rectangular coordinate system shown above, which	Coordinate Geometry,
21	If x/\|x\|<x which of the following must be true about x?	Absolute Values/Modules, Inequalities
22	A certain business produced x rakes each month form November	Word Problems
23	Car B starts at point X and moves clockwise around	Distance/Rate Problems
24	Is \|a\| + \|b\| > \|a + b\| ?	Inequalities, Absolute Values/Modules
25	If the sum of the consecutive integers from -42 to n	Statistics and Sets Problems

Data Sufficiency (DS)
Rank	Title	Topics
1	If a, b and c are integers such that b > a, is b+c > a	Inequalities
2	\|x\|=\|2y\|, what is the value of x-2y?	Absolute Values/Modules, Inequalities
3	Store S sold a total of 90 copies of a certain book during	Word Problems
4	If x^2 = y + 5, y = z - 2 and z = 2x, is x^3 + y^2 + z	Divisibility/Multiples/Factors, Algebra
5	If t is a positive integer and r is the remainder when t^2+5	Remainders
6	Is x > 0? (1) \|x + 3\| = 4x	Absolute Values/Modules, Inequalities
7	If zy < xy < 0, is \| x - z \| + \|x\| = \|z\|?	Absolute Values/Modules, Inequalities
8	Is x > y ? (1) x^(1/2)>y (2) x^3>y	Exponents/Powers, Roots, Inequalities
9	If m and r are two numbers on a number line, what is the	Absolute Values/Modules, Coordinate Geometry,
10	What is the positive integer n?	, Number Properties, Divisibility/Multiples/Factors
11	If A<Y<Z<B, is \|Y-A\|< \|Y-B\|?	Absolute Values/Modules, Inequalities
12	A jar contains 8 red marbles and y white marbles. If Joan	Probability
13	If x is not equal to 0, is \|x\| less than 1? (1) x/\|x\|< x	Absolute Values/Modules, Inequalities
14	What is the value of y?	Absolute Values/Modules
15	In the xy-plane, region R consists of all the points (x, y)	Inequalities, Coordinate Geometry
16	If p, x, and y are positive integers, y is odd, and p = x^2	Divisibility/Multiples/Factors, Remainders
17	Machines X and Y work at their respective constant rates	Work/Rate Problems
18	In triangle ABC, point X is the midpoint of side AC and	Geometry
19	If 2 different representatives are to be selected at random	Probability
20	x is an integer and x raised to any odd integer is greater	Exponents/Powers, Algebra
21	Is the integer n odd? (1) n is divisible by 3. (2) 2n is	Divisibility/Multiples/Factors
22	If x is a positive number less than 10, is z greater than	Inequalities, Absolute Values/Modules
23	If p and n are positive integers and p > n, what is the	Remainders
24	If a and b are positive integers divisible by 6, is 6 the	Divisibility/Multiples/Factors
25	If x and y are integer, what is the remainder when x^2 + y^2	Remainders

Critical Reasoning (CR)
Rank	Title	Topics
1	In Patton City, days are categorized as having heavy	Conclusion
2	For the writers who first gave feudalism its name, the	Must be True
3	Beginning in 1997, high school seniors in State Q have been	Conclusion, Numbers & Percent
4	Recently, the research and development departments at major	Assumption
5	Editorial:The measures taken by our government to force	Assumption
6	In 1986, the city of Los Diablos had 20 days on which air	Additional Evidence
7	If one of the effects of a genetic mutation makes a	Must be True
8	Health Maintenance Organizations (HMOs)....	Weaken, CR Resources
9	The Action-Packed Gaming Company, based on the success of	Assumption
10	Some of our federal legislators are opposed to government	Weaken
11	Biologists suspect that feathers are modified scales.	Assumption
12	For a ten-month period, the total monthly sales of new cars	Must be True
13	Doctors in Britain have long suspected that patients who	Weaken,
14	In the United States, vacationers account for more than half	Must be True
15	Scientists have several rival theories on the causes of	Assumptions
16	All bridges built from 1950 to 1960 are in serious need of	Must be True
17	Naturally occurring chemicals cannot be newly patented once	Must be True
18	It is true of both men and women that those who marry as	Strengthen
19	Those who oppose abortion upon demand make the foundation of	Assumption
20	In a study of factors affecting employee satisfaction ,	Conclusion
21	In general, jobs are harder to get in times of economic	Strengthen
22	The anticipated retirement of tens of thousands of baby	Weaken
23	During a single hour of a pledge drive for a public radio	Resolve Paradox
24	Members of the Amazonian Akabe people commonly take an	Weaken
25	Certain instruments used in veterinary surgery can be made	Additional Evidence, Method of Reasoning

Sentence Correction (SC)
Rank	Title	Topics
1	The manager at the office supply store believes that the new	Comparisons, Parallel Structure
2	Contemporary accounts of the life of Charlemagne, crowned	Parallel Structure
3	The recent spate of traffic jams on Beijing-Tibet highway	Style and Usage, Subject Verb Agreement
4	Originally a trading port, Hong-Kong, currently estimated to	Clauses, Modifiers
5	In some African languages, verbs not only encode the	Idioms,
6	The recent floods in Pakistan were caused by an incessant	Idioms, Verb Tense/Form
7	The paradox of the Roman empires history is marked by the	Parallel Structure, Participle Parallelism
8	Early 16th Century moralist philosophers, particularly in	Parallel Structure
9	It has been estimated that the annual cost of water and	Diction, Idioms
10	In assessing the problems faced by rural migrant workers,	Construction
11	The recent discovery of a red oak tree sap that is	Comparisons, Modifiers, Parallel Structure
12	The new proposal will encourage larger transparency about	Subject Verb Agreement
13	Regarded by opponents as ineffective and meddlesome	Modifiers
14	Supporters of tax breaks that local governments award to	Pronouns
15	Beatrix Potter, in her book illustrations, carefully	Modifiers
16	Out of the publc's interest in the details of and conflicts	Subject Verb Agreement
17	Any medical test will sometimes fail to detect a condition	Pronouns, Gramatical Construction
18	Hoping the customers would not carelessly throw too many of	Pronouns
19	Recently documented examples of neurogenesis, the production	Parallel Structure
20	Scientists calculated that the asteroid, traveling at 46,000	Subject Verb Agreement
21	Deliberately imitating the technique of Louis Armstrong,	Modifiers
22	Out of the public's interest in the details of and conflicts	Subject Verb Agreement
23	The states three problem areas have seen a gradual decrease	Verb Tense/Form, Which/That
24	In good years, the patchwork of green fields that surround	Subject Verb Agreement
25	The computer company's present troubles are a result of	Modifiers, Construction