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Data Sufficiency GMAT Questions

Data Sufficiency GMAT practice questions. Every question below links to its own page with the full solution, community comments, and discussion.

127

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0

With explanations

47

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136

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All types(4)Problem Solving(1710)Critical Reasoning(1023)Data Sufficiency(127)Reading Comprehension(211)

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All categories Absolute Values/Modules(0)Algebra(0)Arithmetic(0)Combinations(0)Coordinate Geometry(0)Distance/Rate Problems(0)Divisibility/Multiples/Factors(0)Exponents/Powers(0)Fractions/Ratios/Decimals(0)Functions

Latest questions

127 questions

DS · Data Sufficiency

Find the maximum value of

a*b

a

b

are prime numbers
(2)

a+b = 10

Latest Community Comments

recent discussion across these questions

N

Noel VijayOct 10

wait, statement 1 says n^2 is not 0... so n isn't zero. but both of my solutions from the equation... hmm does that eliminate one of them?

onData Sufficiency · Algebra—If |n + 5| = 5, what is the value of n? (1) n^2 is not equal to 0. (2)...

A

AshwinOct 7

I think the answer is C. Statement 1 gives primes, statement 2 gives sum 10. Together, possible pairs: (3,7) product 21, (5,5) product 25, (7,3) product 21. So max is 25. So both needed.

onData Sufficiency · Arithmetic

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No explanation3 commentsOct 10

I think the answer is C. Statement 1 gives primes, statement 2 gives sum 10. Together, possible pairs: (3,7) product 21,...

DS · Data Sufficiency

A certain number of marbles are to be removed from a box containing only solid-colored red, yellow, and blue marbles. How many more yellow m...

No explanation3 commentsOct 10

Statement 1 tells us red + blue = 13, so red is at most 13. Statement 2 tells us yellow + blue = 7. Still don't see how ...

DS · Data Sufficiency

Max(x,y) is defined as the maximum of x and y, and Min(x,y) is defined as the minimum of x and y. What is the average of Max(x,60) and Min(4...

No explanation4 commentsOct 10

I got C. Statement 1 tells me x ≤ 60, but that still allows x < 40, so the expression might depend on x. Statement 2 say...

DS · Data Sufficiency

Is the tallest child in Class A taller than the tallest child in Class B?
(1) The range of the heights of the children in Class A is gr...

No explanation4 commentsOct 10

Got E, but only after testing numbers. Anyone have a faster way to see this without plugging in?

DS · Data Sufficiency

It takes Amy between 6 and 7 minutes to grill a steak, and she can only grill one steak at a time. She does not need to take breaks between ...

No explanation4 commentsOct 10

Took me way too long and I still second-guessed myself. The 6-7 min per steak combined with the arrival window is sneaky...

DS · Data Sufficiency

If the terms of a sequence are

t_1, t_2, t_3, ..., t_n

, what is the value of

n

? (1) The sum of the

n

terms is 3,124. (2...

No explanation3 commentsOct 10

Something feels off — statement (1) says the sum is 3,124, but statement (2) says the mean is 4. If both were true at on...

DS · Data Sufficiency

If S is a set of odd integers and 3 and -1 are in S, is -15 in S? (1) 5 is in S. (2) Whenever two numbers are in S, their product is in S. D...

No explanation3 commentsOct 10

Thanks! I was overcomplicating this. I initially thought statement (2) alone might be enough but then realized we need a...

DS · Data Sufficiency

All of the seats in a lecture hall are arranged in 15 rows. After the front row, each row has one more seat than the row in front of it. How...

No explanation4 commentsOct 10

Got D pretty quickly. 505-555 feels right, not too tricky once you spot the sequence.

DS · Data Sufficiency

In a sequence of numbers in which each term after the first term is 1 more than twice the preceding term, what is the fifth term? (1) The fi...

No explanation4 commentsOct 10

Recurrence is a_{n+1} = 2a_n + 1. Statement (1) gives a_1 directly, easy. Statement (2) gives a_6 - a_5 = 32, but note a...

DS · Data Sufficiency

If the 1st term of a sequence is 0 and the 2nd term is 1, is the 5th term 2? (1) Each odd-numbered term is either 0 or 2. (2) The 3rd term i...

No explanation4 commentsOct 10

Got this one wrong at first because I assumed the sequence had to follow some pattern. Took me a second to realize the s...

DS · Data Sufficiency

What is the fifth number in a particular sequence of numbers, if the tenth number in the sequence is 450? (1) The ninth number in the sequen...

No explanation4 commentsOct 10

Statement 2 is enough because you can just keep dividing 450 by 3 until you reach the fifth term.

DS · Data Sufficiency

What is the sum of the terms in a sequence of consecutive multiples of 3? (1) There is an odd number of terms in the sequence. (2) The avera...

No explanation4 commentsOct 10

This one was pretty straightforward for me. The key is to translate the question: sum = average * number of terms. State...

DS · Data Sufficiency

Is the sum of the 12th and 13th terms in a sequence of integers odd? (1) Every term in the sequence is 1 more than the preceding term. (2) T...

No explanation4 commentsOct 10

Quick tip: for these parity questions, just test with small numbers. If T12 is even, T13 is odd, sum is odd. If T12 is o...

DS · Data Sufficiency

S is a finite set of numbers. Does S contain more negative numbers than positive numbers? (1) The product of all the numbers in S is -1,200....

No explanation3 commentsOct 10

Got this right but took me a while. The key for me was realizing that statement (1) alone doesn't tell us how many numbe...

DS · Data Sufficiency

The sequence of four numbers

a_1

a_2

a_3

a_4

is such that each number after the first is

a_1-1

No explanation4 commentsOct 10

Is this really 500-level? The a1-1 as the difference tripped me up. I kept thinking it was just a constant like usual.

DS · Data Sufficiency

If x is an integer, is

x|x| < 2^x

x < 0

x = -10

No explanation0 commentsOct 29, 2025

DS · Data Sufficiency

a = 0

ab = 0

a^2=0

No explanation0 commentsOct 29, 2025

DS · Data Sufficiency

If 2x + 3y = 5, what is the value of x ?

(1) x + z = 3 + 2y + z
(2) y = −1/7

No explanation0 commentsOct 29, 2025

DS · Data Sufficiency

\frac{√x}{y}=n

, what is the value of x?

(1) yn = 10

(2) y = 40 and n = 1/4

No explanation0 commentsOct 29, 2025

DS · Data Sufficiency

How many people did Apex Company employ in 1990?

(1) The company employed 538 more people in 1991 than in 1990.
(2) The comp...

No explanation0 commentsOct 29, 2025

Previous
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Next

—

Find the maximum value of a*b? (1) a and b are prime numbers (2) a+b =...

A

AnsoOct 7@Anso3875

Statement 2 is enough because you can just keep dividing 450 by 3 until you reach the fifth term.

onData Sufficiency · Sequences—What is the fifth number in a particular sequence of numbers, if the t...

R

Rahul RamanOct 6

thanks, this was a nice confidence booster after the last few lol

onData Sufficiency · Algebra—If x = 2y, what is the value of xy ? (1) x > Y (2) 3x - 2y = 14

J

João VitorOct 6

wait why isn't it C? if Q is between P and R and PQ is 5, don't we just need to know how far Q is from R?

onData Sufficiency · Arithmetic—If P, Q, and R are points on the number line, what is the distance bet...

C

Chynna SmithOct 4

Thanks, this one was nice and quick. Statement 1 basically forces x to be a perfect square times something, so it works out.

onData Sufficiency · Algebra—If x is a positive integer, is x x an integer? (1) 4x is an integer. (...

H

Hitesh ThakurOct 1

Got E, but only after testing numbers. Anyone have a faster way to see this without plugging in?

onData Sufficiency · Arithmetic—Is the tallest child in Class A taller than the tallest child in Class...

L

LetíciaSep 29

thanks, this one was pretty straightforward. i got C too.

onData Sufficiency · Arithmetic—P, Q, R receive fixed salary in a company. Salary of Q is what percent...