Data Sufficiency (DS)

02 Oct 2025, 01:36

7!! ER

100 Hardest and easiest questions for DS as of October 2025

1, 2

Bunuel

21 Aug 2015, 03:42

842

24

183,714

by: bumpbot

16 Sep 2025, 06:05

7!! ER

DS Question Directory by Topic and Difficulty

bb

07 Mar 2012, 08:58

1,506

0

480,566

by: bb

07 Mar 2012, 08:58

7!! ER

What is the value of 2^{-y} * 2^{- (x-y)} / 2^{- (x + y)} (1) x – y

555-605 Level | Exponents

555-605 Level | Exponents hide tags

Russ19

16 Dec 2020, 10:32

1

750

by: CrackverbalGMAT

16 Dec 2020, 11:11

7!! ER

A certain list consists of ten non-zero integers. Are all the integers

555-605 Level | Number Properties

555-605 Level | Number Properties hide tags

TheUltimateWinner

12 Dec 2020, 09:47

3

1,116

by: chetan2u

16 Dec 2020, 01:03

7!!

What is the area of circular region S ?

505-555 Level | Geometry

505-555 Level | Geometry hide tags

rhtavares123

14 Dec 2020, 15:45

3

1,221

by: shameekv1989

15 Dec 2020, 08:34

7!! ER

What is the value of x? (1) x^2 = 6x - 9 (2) x^2 = x + 6

505-555 Level | Algebra

505-555 Level | Algebra hide tags

Bunuel

07 Dec 2020, 02:15

1

2,855

by: chetan2u

07 Dec 2020, 03:41

7!!

Is r>s? (1) r = 3s (2) s - 4 = r

555-605 Level | Inequalities

555-605 Level | Inequalities hide tags

MHIKER

04 Dec 2020, 09:54

2

1,857

by: callmeDP

04 Dec 2020, 15:33

7!! ER

Is n divisible by 60?

555-605 Level | Multiples and Factors

555-605 Level | Multiples and Factors hide tags

TheUltimateWinner

03 Dec 2020, 07:47

2

878

by: karnavora1

03 Dec 2020, 22:24

7!! ER

An empty rectangular bin has uniform depth. How long will it take to

555-605 Level | Geometry, Work and Rate Problems

555-605 Level | Geometry, Work and Rate Problems hide tags

Hoozan

25 Nov 2020, 23:44

1

1,480

26 Nov 2020, 00:10

7!! ER

Is integer q divisible by 6? (1) q = 7^n – 1, where n is a positive

555-605 Level | Multiples and Factors

555-605 Level | Multiples and Factors hide tags

Bunuel

22 Nov 2020, 12:05

4

1,333

by: bond001

23 Nov 2020, 04:21

7!! ER

If x, y and z are positive integers, can the value of (x + y

555-605 Level | Algebra

555-605 Level | Algebra hide tags

ProfChaos

19 Nov 2020, 20:03

4

1,166

by: ProfChaos

19 Nov 2020, 22:01

7!! ER

Is the integer a even? (1) a is divisible by 7 (2) a is divisible by 9

555-605 Level | Number Properties

555-605 Level | Number Properties hide tags

Bunuel

17 Nov 2020, 09:15

1

679

by: rajatchopra1994

17 Nov 2020, 09:25

7!! ER

For the triangle shown above, does p = q = 60?

555-605 Level | Geometry

555-605 Level | Geometry hide tags

energetics

06 Feb 2019, 13:58

3

4,083

16 Nov 2020, 01:53

7!!

Is x > y? (1) x/z > y/z (2) x > 0 > z

555-605 Level | Inequalities

555-605 Level | Inequalities hide tags

EncounterGMAT

26 Feb 2019, 08:07

3

1,338

by: MHIKER

13 Nov 2020, 08:12

7!! ER

If x < -1, is x+y/x+1 < x-y/x-1?

705-805 Level | Inequalities

705-805 Level | Inequalities hide tags

BrentGMATPrepNow

10 Nov 2020, 09:07

3

1,341

by: BrentGMATPrepNow

10 Nov 2020, 17:34

7!! ER

If x and y are positive integers and x/y = 2, what is the value of x?

Sub 505 Level | Number Properties

Sub 505 Level | Number Properties hide tags

Bunuel

07 May 2019, 00:58

5

3,176

by: MHIKER

10 Nov 2020, 08:08

7!! ER

What is the measure of angle A?

Sub 505 Level | Geometry

Sub 505 Level | Geometry hide tags

Bunuel

10 Nov 2020, 01:00

1

1,334

by: BrentGMATPrepNow

10 Nov 2020, 07:48

7!! ER

How old is Roy if he is twice as old as his friend Jane, Jane is four

505-555 Level | Word Problems

505-555 Level | Word Problems hide tags

Bunuel

09 Nov 2020, 10:00

1

1,416

by: Jonathanyana

09 Nov 2020, 10:30

7!! ER

When processing iron ore into stainless steel, high-purity oxygen

Poor Quality

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rajatchopra1994

06 Nov 2020, 00:29

2

2,432

06 Nov 2020, 10:26

7!! ER

If x and y are integers, is (x+y)(y+1) an even integer?

555-605 Level | Number Properties

555-605 Level | Number Properties hide tags

chetan2u

06 Nov 2020, 00:14

3

940

by: rajatchopra1994

06 Nov 2020, 00:40

7!! ER

If k is a positive integer, is k a prime number?

505-555 Level | Number Properties

505-555 Level | Number Properties hide tags

Bunuel

04 Nov 2020, 05:45

2

1,284

05 Nov 2020, 15:46

7!! ER

Is xy < 1 ? (1) xy < 2/3 (2) x > 0

Sub 505 Level | Inequalities

Sub 505 Level | Inequalities hide tags

Sajjad1994

02 Nov 2020, 11:06

2

1,940

03 Nov 2020, 17:37

7!! ER

What is the value of positive integer K? (1) 2, 5, and 7 are the only

505-555 Level | Number Properties

505-555 Level | Number Properties hide tags

Bunuel

01 Nov 2020, 00:15

1

857

01 Nov 2020, 14:09

7!! ER

Is integer z divisible by 21? (1) z is divisible by 7. (2) z is divis

Sub 505 Level | Multiples and Factors

Sub 505 Level | Multiples and Factors hide tags

Bunuel

01 Nov 2020, 00:15

1

1,071

by: yashikaaggarwal

01 Nov 2020, 04:18

7!! ER

If x, y, and z are integers and p = x*y*z, is p odd?

505-555 Level | Number Properties

505-555 Level | Number Properties hide tags

Bunuel

01 Nov 2020, 00:16

1

1,469

by: yashikaaggarwal

01 Nov 2020, 03:15

7!! ER

If the total price of five grocery items is $6.05, what is the price

555-605 Level | Word Problems

555-605 Level | Word Problems hide tags

Bunuel

17 Oct 2020, 12:28

2

1,291

18 Oct 2020, 06:54

7!! ER

Distribution D consists of five different numbers. What is the standar

555-605 Level | Statistics and Sets Problems

555-605 Level | Statistics and Sets Problems hide tags

Bunuel

17 Oct 2020, 13:46

3

1,134

by: MathRevolution

18 Oct 2020, 02:58

7!! ER

What is the numerical ratio P:Q:R ?

Sub 505 Level | Fractions and Ratios

Sub 505 Level | Fractions and Ratios hide tags

Bunuel

17 Oct 2020, 13:03

2

1,361

by: sumisachan

17 Oct 2020, 23:13

7!! ER

How long would it take 5 typists to type thirty pages if all 5 typists

Sub 505 Level | Work and Rate Problems

Sub 505 Level | Work and Rate Problems hide tags

Bunuel

17 Oct 2020, 12:49

2

1,976

by: sumisachan

17 Oct 2020, 23:10

7!! ER

Four people plan to rent a summer cottage, apportioning the rent equal

555-605 Level | Word Problems

555-605 Level | Word Problems hide tags

Bunuel

17 Oct 2020, 12:02

1

751

17 Oct 2020, 14:30

7!! ER

How long does it take Sam to eat an entire large pizza? (1) Thomas can

505-555 Level | Work and Rate Problems

505-555 Level | Work and Rate Problems hide tags

Bunuel

17 Oct 2020, 12:10

2

1,015

by: Archit3110

17 Oct 2020, 12:20

7!!

[x] is the greatest integer less than or equal to x, eg, [1.5]=1. [m]=

505-555 Level | Functions and Custom Characters

505-555 Level | Functions and Custom Characters hide tags

siddharthkapoor

09 Oct 2020, 23:20

1

1,347

by: QuantMadeEasy

10 Oct 2020, 00:38

7!! ER

How many seconds long is time period U if U can be no longer than a da

505-555 Level | Word Problems

505-555 Level | Word Problems hide tags

Bunuel

05 Oct 2020, 02:15

2

1,152

by: ah1028

05 Oct 2020, 08:06

7!! ER

How many prime numbers are there strictly greater than 5 and less than

505-555 Level | Number Properties

505-555 Level | Number Properties hide tags

Bunuel

05 Oct 2020, 02:30

1

879

by: Akp880

05 Oct 2020, 05:10

7!! ER

How many books does Ricardo have? (1) If Ricardo had 15 fewer books,

Sub 505 Level | Word Problems

Sub 505 Level | Word Problems hide tags

Bunuel

03 Oct 2018, 02:55

3

4,607

by: Hovkial

04 Oct 2020, 00:49

7!! ER

If Q and R denote the nonzero digits of a three-digit number QRR, is Q

505-555 Level | Multiples and Factors

505-555 Level | Multiples and Factors hide tags

Bunuel

02 Oct 2020, 00:00

1

1,091

by: GMATinsight

02 Oct 2020, 00:24

7!! ER

What is the value of x, if x is an integer?

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kawal27

30 Sep 2020, 01:25

1

897

30 Sep 2020, 01:29

7!! ER

What is 3 percent of y? (1) y=300 (2) 6 percent of y is 18.

Sub 505 Level | Percent and Interest Problems

Sub 505 Level | Percent and Interest Problems hide tags

Bunuel

29 Sep 2020, 01:59

1

1,110

by: saurabh11suman07

29 Sep 2020, 02:14

7!! ER

Is lal*b > 0? 1) a*lbl > 0 2) a*b > 0 Source: GMATinsight

555-605 Level | Absolute Values, Inequalities

555-605 Level | Absolute Values, Inequalities hide tags

GMATinsight

24 Sep 2020, 03:39

3

1,564

27 Sep 2020, 16:49

7!! ER

A baker makes 5 types of pies: cherry, apple, peach, blackberry, and

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mrr0821

24 Sep 2020, 03:09

1

722

24 Sep 2020, 05:31

7!! ER

A box contains red, blue, yellow and orange balls in the ratio of 7:4:

555-605 Level | Fractions and Ratios

555-605 Level | Fractions and Ratios hide tags

Russ19

20 Sep 2020, 05:32

3

3,240

21 Sep 2020, 07:45

7!! ER

Did airline M mishandle at least 50,000 bags last year ?

Sub 505 Level | Word Problems

Sub 505 Level | Word Problems hide tags

Bunuel

15 Sep 2020, 04:15

2

1,174

by: Akp880

15 Sep 2020, 08:48

7!! ER

If a and b are integers, what is the value of a^2 + b^2 ?

Sub 505 Level | Algebra

Sub 505 Level | Algebra hide tags

Bunuel

15 Sep 2020, 05:00

3

1,673

by: Akp880

15 Sep 2020, 06:17

7!!

If N=a^5b^4c where a, b, and c are three distinct prime numbers

555-605 Level | Number Properties

555-605 Level | Number Properties hide tags

TheUltimateWinner

01 Sep 2020, 09:49

2

1,252

by: aloysiusgaul

03 Sep 2020, 14:06

7!! ER

If w < x < y < z, is the product of four numbers negative?

555-605 Level | Inequalities

555-605 Level | Inequalities hide tags

Bunuel

10 Jun 2018, 05:06

2

1,972

by: bumpbot

01 Sep 2020, 05:44

7!! ER

John, Pete, and Tim are running 100-meter races to prepare for a champ

Sub 505 Level | Word Problems

Sub 505 Level | Word Problems hide tags

Bunuel

18 Oct 2016, 23:54

2

2,651

by: CrackverbalGMAT

28 Aug 2020, 22:45

7!! ER

Is y equal to 25% greater than x? (I) 75% of x is equal to 60% of y. (

505-555 Level | Percent and Interest Problems

505-555 Level | Percent and Interest Problems hide tags

Russ19

27 Aug 2020, 06:02

3

1,273

by: EgmatQuantExpert

27 Aug 2020, 08:43

7!! ER

What is the last digit of the positive integer n ?

605-655 Level | Number Properties

605-655 Level | Number Properties hide tags

Bunuel

15 Jan 2020, 02:15

2

3,126

by: kntombat

25 Aug 2020, 12:16

7!!

Given x/2 > y/3? (1) 3x > 2y (2) x > y

555-605 Level | Inequalities

555-605 Level | Inequalities hide tags

Russ19

07 Aug 2020, 07:57

3

1,421

by: hiranmay

08 Aug 2020, 09:34

7!! ER

A rectangle is equal in area to a square with sides of length 12. Is

505-555 Level | Geometry

505-555 Level | Geometry hide tags

Bunuel

26 Jul 2016, 09:51

4

5,015

by: hemantbafna

05 Aug 2020, 04:43

7!! ER

If x and y are integers such that x>y>1, what is the value of xy?

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dracarys007

27 Jul 2020, 23:39

1

846

by: GMATinsight

27 Jul 2020, 23:52

7!! ER

What is the value of X ?

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nkme2007

26 Jul 2020, 10:39

2

778