100 Hardest Data Sufficiency Questions : GMAT Data Sufficiency (DS)
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# 100 Hardest Data Sufficiency Questions

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100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 01:26
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100 Hardest Data Sufficiency Questions

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 100 questions from DS forum.
 Data Sufficiency (DS) Rank Title Topics 1 Train A leaves New York for Boston at 3 PM and travels at Distance/Rate Problems 2 Bob and Wendy left home to walk together to a restaurant for Distance/Rate Problems 3 For integers a and b, if (a^3 a^2 b)^1/2 = 7, what is the Algebra 4 If, in the addition problem above, a, b, c, d, e, f, x, y, a Arithmetic 6 If a does not = 0, is 1/a > a/(b^4 + 3) Algebra/Inequalities 7 w, x, y, and z are integers. If z > y > x > w, is |w| > x^2 Inequalities/Absolute Values/Modules 8 w, x, y, and z are integers. If w >x>y>z>0, is y a common Number Properties/Divisibility/Multiples/Factors 9 In a group of 80 college students, how many own a car? (1) Overlapping Sets 10 In the correctly worked addition problem above, A, B, C, D Arithmetic/Number Properties 11 A rectangle is plotted on the standard coordinate plane Coordinate Geometry 12 If w>x>y>z>0, is z>4? Fractions/Ratios/Decimals/Inequalities 13 The average of 5 distinct single digit integers is 5. If Number Properties 15 If 20 Swiss Francs is enough to buy 9 notebooks and 3 Inequalities/Word Problems 16 Is |2a 3b| < |a b| + |a 2b| Absolute Values/Modules 17 If x and y are positive integers, what is the greatest Divisibility/Multiples/Factors 18 What is the perimeter of PQRS ? (1) x = 30 degree Geometry 19 If x, y, and z are positive integers such that x < y < z Number Properties/Divisibility/Multiples/Factors 20 How many subordinates does Marcia have? Combinations 21 At a restaurant, a group of friends ordered four main dishes Min/Max Problems 22 A certain salesman's yearly income is determined by a base Percent and Interest Problems/Word Problems 23 Is 1/(x-y) < y - x Algebra/Inequalities 24 Between 1980 and 1985, Pierres investment portfolio increas Percent and Interest Problems 25 A cube is made up of equal smaller cubes. Two of the sides Geometry 26 Of all the attendees at a dinner party, 40% were women. If Overlapping Sets 27 If x and y are positive integers is y odd? Number Properties/Algebra 28 If 5a=9b=15c, what is the value of a+b+c? Algebra 29 In a certain club, every member likes red wine or white wine Overlapping Sets 30 Jane can paint the wall in J hours, and Bill can paint the Work/Rate Problems/Word Problems 31 A set of nonnegative integers consists of Sequences 32 A committee of 2 people is to be formed from a group of 8 Probability 33 In the xy-plane, region R consists of all the points (x, y) Inequalities/Coordinate Geometry 34 If x is an integer, what is the value of x? Absolute Values/Modules 35 If the graph of y = x^2 + ax + b passes through the points Coordinate Geometry 36 If p, x, and y are positive integers, y is odd, and p = x^2 Divisibility/Multiples/Factors/Number Properties/Remainders 37 Is x^2*y^4 an integer divisible by 9 ? Number Properties/Divisibility/Multiples/Factors 38 A person inherited few gold coins from his father. If he Remainders/Word Problems 40 Laura sells encyclopaedias, and her monthly income has two Word Problems/Out of Scope - Too Hard 41 If x, y, and z are integers greater than 1, and Number Properties/Exponents/Powers 42 If n is an integer greater than 1 is 3^n-2^n divisible by 35 Number Properties/Exponents/Powers/Divisibility/Multiples/Factors 43 Is |x|<1? Inequalities/Absolute Values/Modules 44 Is A + B + C even? Number Properties 45 If a, b and c are integers such that b > a, is b+c > a Inequalities/Geometry 46 Reiko drove from point A to point B at a constant speed, and Distance/Rate Problems 47 If x^2 = y + 5, y = z - 2 and z = 2x, is x^3 + y^2 + z Divisibility/Multiples/Factors/Algebra 48 A Farey sequence of order n is the sequence of fractions Sequences 49 Last year, a certain company began manufacturing product X a Word Problems 50 At Western Springs School there are 150 total students Overlapping Sets 51 Is A positive? x^2-2x+A is positive for all x Ax^2+1 is Algebra 54 If for any positive integer x, d[x] denotes its smallest odd Divisibility/Multiples/Factors/Functions and Custom Characters 55 x is an integer and x raised to any odd integer is greater Exponents/Powers/Algebra 56 If x^2 = y + 5 , y = z - 2 and z = 2x , is x^3 + y^2 + z Algebra/Divisibility/Multiples/Factors 58 Six shipments of machine parts were shipped from a factory Fractions/Ratios/Decimals/Word Problems 59 Does the curve (x-a)^2 + (y-b)^2=16 intersect the y-axis ? Coordinate Geometry/Geometry 60 If a and b are positive integers, what is the remainder when Divisibility/Multiples/Factors/Number Properties/Remainders 61 If p and q are negative, is p/q > 1 Absolute Values/Modules/Inequalities 62 Is x^2 + y^2 > 100? Exponents/Powers/Algebra 63 If vertices of a triangle have coordinates (-2,2), (3,2) and Coordinate Geometry/Absolute Values/Modules 64 If xy 0, is x > y? (1) 4x = 3y (2) |y - x| = x - y Absolute Values/Modules/Inequalities 65 Is xy<0 ? (1) x^3*y^5/x*y^2 <0 (2) |x|-|y|<|x-y Absolute Values/Modules/Inequalities 66 If m and n are positive integers, is the remainder of Remainders 67 A right circular cone, twice as tall as it is wide at its Geometry 68 If the base score is between 10 and 99, the bonus is equal Word Problems/Arithmetic 69 Which of the two values 10^(-2) and 10^(-3), is x more close Arithmetic/Exponents/Powers 70 If x is positive, what is the value of |x 3| 2|x 4| + Inequalities/Absolute Values/Modules 71 A car dealership carries only sedans and SUVs Word Problems/Percent and Interest Problems 72 If a, b, and c are integers such that 0 < a < b < c < 10, is Divisibility/Multiples/Factors 73 If x < p < q < y. Is |q - x| < |q - y|? Inequalities/Absolute Values/Modules 75 A jar contains 8 red marbles and y white marbles. If Joan Probability 76 If x and y are negative numbers, is x<y? Inequalities 77 If m and n are positive integers, is m^n < n^m? Exponents/Powers/Inequalities 78 At a particular store, candy bars are normally priced at \$1. Word Problems 79 Trains A and B left stations R and S simultaneously on two s Distance/Rate Problems 80 How many factors does the integer X have? Absolute Values/Modules/Algebra/Exponents/Powers 81 The sum of the integers in list S is the same as the sum of Statistics and Sets Problems 82 What does |2b| equal? Absolute Values/Modules/Algebra 83 A circle is drawn on a coordinate plane. If a line is drawn Geometry 84 If w, x, y and z are integers such that w/x and y/z are Number Properties 85 If x and y are non-zero integers and |x| + |y| = 32, what is Absolute Values/Modules 86 The integers m and p are such that 2<m<p, and m is not a Number Properties/Remainders/Divisibility/Multiples/Factors 87 If p is a positive odd integer, what is the remainder when p Remainders 88 Sequence S consists of 24 nonzero integers. If each term in Sequences 89 ax + by=10, ay + bx=12. which one is greater here, x or y ? Inequalities 90 Shaina's five-distinct-digit locker code is 5A48B. What Divisibility/Multiples/Factors 91 Is x > y ? (1) x^(1/2)>y (2) x^3>y Exponents/Powers/Roots/Inequalities 92 In a certain sequence, each term, starting with the 3rd term Sequences 93 |x|=|2y|, what is the value of x-2y? Absolute Values/Modules/Inequalities 94 If 6xy = x2y + 9y, what is the value of xy? Algebra 95 One kilogram of a certain coffee blend consists of x Word Problems/Mixture Problems 96 If a, b, and c are positive integers such that 1/a + 1/b = 1 Fractions/Ratios/Decimals/Inequalities 99 The Range of Set A is R. A number having equal value to R Statistics and Sets Problems 100 If x, y, and z are integers, and x < y < z, is z y = y Statistics and Sets Problems 101 In the table above is shown the percent reduction in the Percent and Interest Problems/Word Problems 102 Is the perimeter of triangle ABC greater than 20? (1) Geometry 103 What is the probability that rs=r? Probability 104 If zy < xy < 0, is | x - z | + |x| = |z|? Absolute Values/Modules/Inequalities 105 x and y are positive integers such that x=8y+12, what is the Number Properties/Divisibility/Multiples/Factors 106 Ashok and Brian are both walking east along the same path Distance/Rate Problems 107 If x, y and z are integers and xy + z is an odd integer, is Number Properties 108 Is (7x)^1/2 an integer? Roots/Number Properties 109 In a certain building, 1/5 of the offices have both a window Overlapping Sets

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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 02:05
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Are the hardest Bunnel? Can we safely say that? Would be a really good set of various questions to build your own stamina...

Thanks.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 02:07
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carcass wrote:
Are the hardest Bunnel? Can we safely say that? Would be a really good set of various questions to build your own stamina...

Thanks.

They are hardest according to our timer.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 02:36
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Are you working on PS to I guess....

I'm thinking to collect the sets then, similar to Bunuels collection.

Regards
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 02:44
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Are any of these problems from GMAT prep? If there are any problems from GMAT prep, could you please highlight them with a different colour under the rank column.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 02:51
carcass wrote:
Are you working on PS to I guess....

I'm thinking to collect the sets then, similar to Bunuels collection.

Regards

PS is ready and will be published next week.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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30 Oct 2013, 02:52
fozzzy wrote:
Are any of these problems from GMAT prep? If there are any problems from GMAT prep, could you please highlight them with a different colour under the rank column.

Yes, there are some questions from GMAT Prep and OG, which have appropriate tags when you follow the links.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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25 Nov 2013, 05:57
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Hi,

If possible can you make these topics hyperlink which redirects to concepts or may be question bank on same topic???

Just a thought.

Thanks.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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25 Nov 2013, 06:10
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beatthegmat05 wrote:
Hi,

If possible can you make these topics hyperlink which redirects to concepts or may be question bank on same topic???

Just a thought.

Thanks.

Something like that is done here: new-project-review-discuss-and-get-kudos-points-153555.html

Hope it helps.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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25 Nov 2013, 12:22
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Are these questions available in single file ?
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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26 Nov 2013, 07:37
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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26 Nov 2013, 07:44
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kulkarnios wrote:

DS: 100-hardest-data-sufficiency-questions-all-in-one-doc-162866.html
PS: bunuel-s-100-hardest-problem-solving-questions-in-one-doc-163175.html

Hope this helps.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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12 Apr 2014, 15:25
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Would be great if you show these attachments in the first post..
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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17 Apr 2014, 00:48
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tnx lot for questions
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best for iranian

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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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10 Jul 2014, 22:54
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Thanks a lot Bunuel. Data Sufficiency is my weak area and this would surely help. Thanks!!
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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02 Sep 2014, 20:59
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It should be clear fairly quickly that neither statement alone is sufficient. For a lot of students, the phrase “well it could be anything”—the kind of massive generality that should be avoided on the GMAT—will follow them all the way to E without much thought or elbow grease.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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14 May 2015, 05:45
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Thanks a lot Bunuel.

I have a question about DS strategy .

When you solve a DS question, you solve each data (1) and (2) wholy every time ?
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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31 May 2015, 04:33
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Great Collection. Although time taking Qs but very good to build stamina.
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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31 Jul 2015, 11:01
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Thanks Bunuel for sharing this wonderful collection.

DS is the toughest part IMO. From that working on tough ques is really amazing and challenging.

BTW, ques no 47 & 56 are repeated. can you add any other ques in any of that place ?
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Re: 100 Hardest Data Sufficiency Questions [#permalink]

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02 Aug 2016, 12:06
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Re: 100 Hardest Data Sufficiency Questions   [#permalink] 02 Aug 2016, 12:06
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