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25 Hardest Questions on GMAT Club [List]
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Updated on: 13 Dec 2012, 00:28
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^(n1) + 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 coldwater and the hotwater  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 1x<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 threedigit  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 bottlenosed 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 x2y?  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 YA< YB?  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 xyplane, 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 ActionPacked 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 tenmonth 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 BeijingTibet highway  Style and Usage, Subject Verb Agreement  4  Originally a trading port, HongKong, 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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Originally posted by bb on 12 Dec 2012, 16:20.
Last edited by bb on 13 Dec 2012, 00:28, edited 2 times in total.
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Re: 25 Hardest Questions on GMAT Club [List]
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13 Dec 2012, 01:08
Wow....this is just great. Great work BB.
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Re: 25 Hardest Questions on GMAT Club [List]
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13 Dec 2012, 02:05
Haha... No Bold Faced CRs in the top 25???
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Re: 25 Hardest Questions on GMAT Club [List]
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13 Dec 2012, 04:57
I'll dive into as soon as possible. Great BB
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Re: 25 Hardest Questions on GMAT Club [List]
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13 Dec 2012, 11:43
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]
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13 Dec 2012, 11:54
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]
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14 Dec 2012, 12:54
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]
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17 Dec 2012, 06:40
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]
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20 Aug 2013, 18:22
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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25 Nov 2016, 20:19
Hi bb i found some questions on this post a bit challenging to do in 2 minute duration,but it was fun to solve most questions. Please add some more if you find the time. Also I encountered a problem in the link, When I tried to access Q12 and Q16 of CR "Must be True" category I got a message stating Quote: You are not authorised to read this forum. I am relatively new to the club so am not aware of rules of access. Anyways it was a good drill Thanx for the great post




Re: 25 Hardest Questions on GMAT Club [List]
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25 Nov 2016, 20:19






