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25 Hardest Questions on GMAT Club [List] [#permalink ]
12 Dec 2012, 15:20
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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|<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

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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Last edited by

bb on 12 Dec 2012, 23:28, edited 2 times in total.

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 00:08

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 01:05
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Haha... No Bold Faced CRs in the top 25???

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 03:57

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 10:41

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 10:43
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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 10:54
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MacFauz wrote:

Haha... No Bold Faced CRs in the top 25???

Yes, it is interesting indeed. if you have a question in particular (a URL) of a bold face CR question that you would like me to research as to the difficulty, I will be happy to.

P.S. Not all of these are super hard questions, some appear easy and just end up being tricky at the end.

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
13 Dec 2012, 11:40

Just what I was looking for, thanks!

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
14 Dec 2012, 11:54

Great one BB! That would take my score as well as that of a number of other aspired GMATers a long way

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
15 Dec 2012, 13:25

thanks bb for posting this !!

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
17 Dec 2012, 05:40
bb wrote:

MacFauz wrote:

Haha... No Bold Faced CRs in the top 25???

Yes, it is interesting indeed. if you have a question in particular (a URL) of a bold face CR question that you would like me to research as to the difficulty, I will be happy to.

P.S. Not all of these are super hard questions, some appear easy and just end up being tricky at the end.

People always think that doing super tough hard unbelievable question will achive a great score.

Wrong for two reasons: first of all about 10% of question during the test are really super tough; moreover, is not sure that you will arrive at that point of the test, aka a lower score. An hard question is simply a mid level question wrapped more difficult or with a chain in the reasoning a bit convoluted. All this leads us to the second point

Secondly: if you pick all the quetions at mid upper level (from 600 650/680), you'll know how to solve these questions thinking to your girl friend at the same time;then , you can expect to achive the better score, otherwise do not. People think: I do a 700 level question and then his/her score is 550 why??? and so on and so forth.....

To make a long story short: this set is really really good. if I have time I'll put all the questions in a PDF format.

Thanks BB

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
20 Aug 2013, 13:27
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16 and 22 in SC are the same question

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Re: 25 Hardest Questions on GMAT Club [List] [#permalink ]
20 Aug 2013, 17:22
Thanks! Interesting that they are 5 spots apart. Amount 10k questions that's pretty darn precise!

Thank you. I will keep it as is for now. Will revise the list in the next few weeks.

Posted from my mobile device.

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Re: 25 Hardest Questions on GMAT Club [List]
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20 Aug 2013, 17:22