Author
Message
TAGS:

Hide Tags
Math Expert

Joined: 02 Sep 2009

Posts: 32990

Followers: 5751

Kudos [? ]:
70457
[51 ]
, given: 9845

100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 02:26
51

This post received KUDOS

216

This post was BOOKMARKED

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

_________________

New to the Math Forum? Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders ; 8. Overlapping Sets | PDF of Math Book ; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years. 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 ? Extra-hard Quant Tests with Brilliant Analytics

Moderator

Joined: 01 Sep 2010

Posts: 2878

Followers: 653

Kudos [? ]:
5179
[1 ]
, given: 883

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 03:05
1

This post received KUDOS

1

This post was BOOKMARKED

Math Expert

Joined: 02 Sep 2009

Posts: 32990

Followers: 5751

Kudos [? ]:
70457
[3 ]
, given: 9845

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 03:07
3

This post received KUDOS

Moderator

Joined: 01 Sep 2010

Posts: 2878

Followers: 653

Kudos [? ]:
5179
[1 ]
, given: 883

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 03:36
1

This post received KUDOS

1

This post was BOOKMARKED

Director

Joined: 29 Nov 2012

Posts: 900

Followers: 12

Kudos [? ]:
791
[1 ]
, given: 543

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 03:44
1

This post received KUDOS

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.

_________________

Click +1 Kudos if my post helped... Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/ GMAT Prep software What if scenarios gmat-prep-software-analysis-and-what-if-scenarios-146146.html

Math Expert

Joined: 02 Sep 2009

Posts: 32990

Followers: 5751

Kudos [? ]:
70457
[0 ] , given: 9845

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 03:51

Math Expert

Joined: 02 Sep 2009

Posts: 32990

Followers: 5751

Kudos [? ]:
70457
[0 ] , given: 9845

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
30 Oct 2013, 03:52

Intern

Joined: 13 Feb 2013

Posts: 20

Location: United States

Concentration: Finance, General Management

GMAT Date : 07-28-2014

GPA: 3.75

WE: Consulting (Computer Software)

Followers: 1

Kudos [? ]:
4
[2 ]
, given: 2

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
25 Nov 2013, 06:57
2

This post received KUDOS

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.

Math Expert

Joined: 02 Sep 2009

Posts: 32990

Followers: 5751

Kudos [? ]:
70457
[2 ]
, given: 9845

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
25 Nov 2013, 07:10
2

This post received KUDOS

Intern

Joined: 14 Jun 2013

Posts: 11

Concentration: Operations, General Management

Followers: 0

Kudos [? ]:
2
[1 ]
, given: 103

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
25 Nov 2013, 13:22
1

This post received KUDOS

Are these questions available in single file ?

Manager

Joined: 05 Jun 2013

Posts: 59

Location: India

Concentration: Entrepreneurship, General Management

GMAT 1 : 640 Q48 V29

GPA: 3.6

WE: Business Development (Education)

Followers: 0

Kudos [? ]:
10
[1 ]
, given: 31

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
26 Nov 2013, 08:37
1

This post received KUDOS

can we download all these probs in a single file?

Math Expert

Joined: 02 Sep 2009

Posts: 32990

Followers: 5751

Kudos [? ]:
70457
[4 ]
, given: 9845

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
26 Nov 2013, 08:44
4

This post received KUDOS

Senior Manager

Joined: 17 Sep 2013

Posts: 394

Concentration: Strategy, General Management

GMAT 1 : 730 Q51 V38

WE: Analyst (Consulting)

Followers: 18

Kudos [? ]:
214
[1 ]
, given: 139

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
12 Apr 2014, 16:25
1

This post received KUDOS

Would be great if you show these attachments in the first post..

_________________

Appreciate the efforts...KUDOS for all Don't let an extra chromosome get you down..

Intern

Joined: 13 Apr 2014

Posts: 14

Followers: 1

Kudos [? ]:
1
[1 ]
, given: 1

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
17 Apr 2014, 01:48
1

This post received KUDOS

tnx lot for questions

_________________

www.gmatacademy.ir best for iranian

Intern

Joined: 02 Nov 2013

Posts: 4

Followers: 0

Kudos [? ]:
1
[1 ]
, given: 11

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
10 Jul 2014, 23:54
1

This post received KUDOS

Thanks a lot Bunuel. Data Sufficiency is my weak area and this would surely help. Thanks!!

Intern

Joined: 02 Sep 2014

Posts: 16

Followers: 0

Kudos [? ]:
1
[1 ]
, given: 0

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
02 Sep 2014, 21:59
1

This post received KUDOS

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.

Intern

Joined: 20 Mar 2015

Posts: 5

Followers: 0

Kudos [? ]:
1
[1 ]
, given: 1

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
14 May 2015, 06:45
1

This post received KUDOS

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 ?

Intern

Joined: 13 Dec 2013

Posts: 20

Location: India

Concentration: Strategy, Operations

GMAT 1 : 660 Q51 V27

WE: Information Technology (Manufacturing)

Followers: 1

Kudos [? ]:
9
[1 ]
, given: 86

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
31 May 2015, 05:33
1

This post received KUDOS

Great Collection. Although time taking Qs but very good to build stamina.

Manager

Joined: 26 Nov 2014

Posts: 112

Followers: 0

Kudos [? ]:
57
[1 ]
, given: 8

Re: 100 Hardest Data Sufficiency Questions [#permalink ]

Show Tags
31 Jul 2015, 12:01
1

This post received KUDOS

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 ?

_________________

Consider Kudos for my post, if it is helpful. TIA

Re: 100 Hardest Data Sufficiency Questions
[#permalink ]
31 Jul 2015, 12:01