Data Sufficiency

Data Sufficiency questions do not ask you to solve — they ask whether you could solve. Each question gives a prompt and two statements, and the five answer choices are always the same: statement 1 alone, statement 2 alone, both together, either alone, or neither. That fixed structure is learnable, and it is where most test takers leak points early on. Practice the AD/BCE elimination habit, resist the urge to compute all the way to a value, and watch for the classic traps: statements that smuggle in hidden constraints, and "obviously sufficient" statements that fail on negatives, zero, or fractions.

Official GMAT Data Sufficiency questions — decide whether the statements are enough to answer.·Show:20 30 50

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555-605 (Medium)

In a certain store, item X sells for 10 percent less than item Y. What is the ratio of the store’s revenue from the sales of item X to that from the sales of item Y? (1) The store sells 20 percent more units of item Y than of item X. (2) The store’s revenue from the sales of item X is

6, 000 an df r o m t h es a l eso f i t e mY i s

8,000.

Sub 505 (Easy)

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

605-655 (Medium)

In rectangular region PQRS above, T is a point on side PS. If PS = 4, what is the area of region PQRS? (1) Triangle QTR is equilateral. (2) Segments PT and TS have equal length.

605-655 (Medium)

Are there exactly 3 distinct symbols used to create the code words in language Q? (1) The set of all code words in language Q is the set of all possible distinct horizontal arrangements of one or more symbols, with no repetition. (2) There are exactly 15 code words in language Q

555-605 (Medium)

What is the value of the two-digit number x? (1) The sum of the two digits is 4. (2) The difference between the two digits is 2.

655-705 (Hard)

A rectangle is defined to be "silver" if and only if the ratio of its length to its width is 2 to 1. If rectangle S is silver, is rectangle R silver? (1) R has the same area as S (2) The ratio of one side of R to one side of S is 2 to 1.

Sub 505 (Easy)

How many students are enrolled in the Groveville Public Schools? (1) There are 30 students per classroom in the Groveville Public Schools. (2) The student-teacher ratio is 20 to 1 in the Groveville Public Schools

555-605 (Medium)

Each M-type unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes, of the computer? (1) 2 M-type memory units will increase the computer’s base memory by 300 percent. (2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity after 1 M-type memory unit is added to the base memory capacity.

505-555 (Easy)

Exactly how many bonds does Bob have? (1) Of Bob’s bonds, exactly 21 are worth at least $5,000 each (2) Of Bob’s bonds, exactly 65 percent are worth less than $5,000 each

555-605 (Medium)

What is the value of x^2 - y^2? (1) x + y = 2x (2) x - y = 0

505-555 (Easy)

If x is an integer, what is the value of x ? (1) 1 5 1 5 < 1 ( x + 1 ) 1 ( x + 1 ) < 1 2 1 2 (2) ( x − 3 ) ( x − 4 ) ( x − 3 ) ( x − 4 ) = 0

555-605 (Medium)

What is the value of x^2 - y^2? (1) x + y = 2x (2) x + y = 0

505-555 (Easy)

If x y ≠ 0 x y ≠ 0 , what is the value of ( x 4 * y 2 − ( x y ) 2 ) ( x 3 * y 2 ) ( x 4 * y 2 − ( x y ) 2 ) ( x 3 * y 2 ) (1) x = 2 (2) y = 8 (1) x = 2 (2) y = 8

505-555 (Easy)

Does x = 2? (1) x is a number such that x^2 – 3x + 2 = 0. (2) x is a number such that x^2 – x – 2 = 0.

505-555 (Easy)

If tank X contains only gasoline, how many kiloliters of gasoline are in tank X. (1) If 1/2 of the gasoline in tank X were pumped out, the tank would be fillef to 1/3 of its capacity. (2) If .75 kiloliter of gasoline were pumped into tank X, it would be filled to capacity. (1) If 1/2 of the gasoline in tank X were pumped out, the tank would be fillef to 1/3 of its capacity. (2) If .75 kiloliter of gasoline were pumped into tank X, it would be filled to capacity.

Sub 505 (Easy)

If n is a positive integer, are n and 1 the only positive divisors of n? (1) n is less than 14. (2) If n is doubled, the result is less than 27

505-555 (Easy)

In ΔPQR above is PQ > RP? (1) x = y (2) y = z

505-555 (Easy)

Is x y < 0 x y < 0 ? (1) x 2 * y 3 < 0 x 2 * y 3 < 0 (2) x y 2 > 0 x y 2 > 0

Sub 505 (Easy)

Is x > y? (1) 0 < x < 0.75 (2) 0.25 < y < 1.0

Sub 505 (Easy)

Two accountants, Rhodes and Smith, went to a business meeting together. Rhodes drove to the meeting, and Smith drove back from the meeting. If Rhodes and Smith each drove 140 kilometers, what was the average speed, in kilometers per hour, at which Rhodes drove? (1) The average speed at which Smith drove was 70 kilometers per hour. (2) Rhodes drove for exactly 2 hours.

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