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100 Hardest Data Sufficiency Questions

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

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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 30 Oct 2013, 02:05
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 30 Oct 2013, 02:07
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 30 Oct 2013, 02:36
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 30 Oct 2013, 02:44
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] New post 30 Oct 2013, 02:51
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 30 Oct 2013, 02:52
Expert's post
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.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 25 Nov 2013, 05:57
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] New post 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.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 25 Nov 2013, 12:22
Are these questions available in single file ?
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 26 Nov 2013, 07:37
can we download all these probs in a single file?
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 26 Nov 2013, 07:44
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kulkarnios wrote:
can we download all these probs in a single file?


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.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 12 Apr 2014, 15:25
Would be great if you show these attachments in the first post.. :thumbup:
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 17 Apr 2014, 00:48
tnx lot for questions
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Re: 100 Hardest Data Sufficiency Questions [#permalink] New post 10 Jul 2014, 22:54
Thanks a lot Bunuel. Data Sufficiency is my weak area and this would surely help. Thanks!!
Re: 100 Hardest Data Sufficiency Questions   [#permalink] 10 Jul 2014, 22:54
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