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25 Hardest Questions on GMAT Club [List]

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25 Hardest Questions on GMAT Club [List] [#permalink] New post 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
1If x is positive, which of the following could be correct Inequalities, Must be True Questions
2In a room filled with 7 people, 4 people have exactly 1 Combinations, Probability
3If x > y^2 > z^4, which of the following statements could be Algebra
4In the infinite sequence A, An = X^(n-1) + X^n + X^(n+1) + X Algebra, Sequences
5In a village of 100 households, 75 have at least one DVD Overlapping Sets
6The water level in a rectangular swimming pool measuring 60 Geometry
7In a certain bathtub, both the cold-water and the hot-waterWork/Rate Problems
8If x=3/4 and y=2/5, what is the value ofRoots, Absolute Values/Modules
9For how many ordered pairs (x, y) that are solutions of the Absolute Values/Modules, Inequalities
10How many times will the digit 7 be written?Combinations
11If equation |x/2|+|y/2| = 5 encloses a certain region Absolute Values/Modules, Coordinate Geometry
12100 people are attending a newspaper conference. 45 of themOverlapping Sets, Min/Max Problems
13If x is an integer and |1-x|<2 then which of the followingAbsolute Values/Modules, Must be True Questions
14Which of the following represents the complete range of xInequalities, Absolute Values/Modules
15Coach Miller is filling out the starting lineup for his Combinations
16If x represents the sum of all the positive three-digitCombinations
17What is the tenth digit to the right of the decimal pointFractions/Ratios/Decimals
18x/|x|<x. which of the following must be true about x ? Inequalities, Absolute Values/Modules
19On average, the bottle-nosed dolphin comes up for air oncePercents and Interest Problems
20In the rectangular coordinate system shown above, which Coordinate Geometry,
21If x/|x|<x which of the following must be true about x? Absolute Values/Modules, Inequalities
22A certain business produced x rakes each month form NovemberWord Problems
23Car B starts at point X and moves clockwise aroundDistance/Rate Problems
24Is |a| + |b| > |a + b| ? Inequalities, Absolute Values/Modules
25If the sum of the consecutive integers from -42 to nStatistics and Sets Problems





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





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




Sentence Correction (SC)
Rank Title Topics
1The manager at the office supply store believes that the new Comparisons, Parallel Structure
2Contemporary accounts of the life of Charlemagne, crowned Parallel Structure
3The recent spate of traffic jams on Beijing-Tibet highway Style and Usage, Subject Verb Agreement
4Originally a trading port, Hong-Kong, currently estimated to Clauses, Modifiers
5In some African languages, verbs not only encode the Idioms,
6The recent floods in Pakistan were caused by an incessant Idioms, Verb Tense/Form
7The paradox of the Roman empires history is marked by the Parallel Structure, Participle Parallelism
8Early 16th Century moralist philosophers, particularly in Parallel Structure
9It has been estimated that the annual cost of water and Diction, Idioms
10In assessing the problems faced by rural migrant workers, Construction
11The recent discovery of a red oak tree sap that isComparisons, Modifiers, Parallel Structure
12The new proposal will encourage larger transparency about Subject Verb Agreement
13Regarded by opponents as ineffective and meddlesome Modifiers
14Supporters of tax breaks that local governments award to Pronouns
15Beatrix Potter, in her book illustrations, carefullyModifiers
16Out of the publc's interest in the details of and conflictsSubject Verb Agreement
17Any medical test will sometimes fail to detect a condition Pronouns, Gramatical Construction
18Hoping the customers would not carelessly throw too many ofPronouns
19Recently documented examples of neurogenesis, the production Parallel Structure
20Scientists calculated that the asteroid, traveling at 46,000Subject Verb Agreement
21Deliberately imitating the technique of Louis Armstrong, Modifiers
22Out of the public's interest in the details of and conflicts Subject Verb Agreement
23The states three problem areas have seen a gradual decrease Verb Tense/Form, Which/That
24In good years, the patchwork of green fields that surroundSubject Verb Agreement
25The 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] New post 13 Dec 2012, 00:08
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Re: 25 Hardest Questions on GMAT Club [List] [#permalink] New post 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] New post 13 Dec 2012, 03:57
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Re: 25 Hardest Questions on GMAT Club [List] [#permalink] New post 13 Dec 2012, 10:41
Great!

Added to my TO-DO list.
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Re: 25 Hardest Questions on GMAT Club [List] [#permalink] New post 13 Dec 2012, 10:43
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Wonderful post bb... :) Kudos man..!

I'll soon go after these and share my thoughts.
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Re: 25 Hardest Questions on GMAT Club [List] [#permalink] New post 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] New post 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] New post 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] New post 15 Dec 2012, 13:25
thanks bb for posting this !!
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Re: 25 Hardest Questions on GMAT Club [List] [#permalink] New post 17 Dec 2012, 05:40
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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] New post 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] New post 20 Aug 2013, 17:22
Expert's post
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]   [#permalink] 20 Aug 2013, 17:22
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