# GMAT Data Sufficiency Question Bank

 Categories : Data Sufficiency What was the revenue that the movie theater earned from Friday to Sunday if the occupancy rate of its three screens 1, 2, and 3 were the following?                       Friday       Saturday     Sunday         Screen 1           85%    ... Categories : Data Sufficiency, Prime Numbers Q) Is the sum of all the numbers between prime numbers x and y an even or an odd number?1)    x = 3  y = 312)    y is the largest two digit number, x is evenA. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.AnswerTo answer data sufficiency questions you don’t have to solve the problem. You just have to find the... Categories : Rate Problems, Work Problems X and Y, two computer engineers, built identical websites at different constant rates. X, working alone for 7 hours, built some of the website; then Y, working alone for 6 hours, built the rest of the website. How many hours would it have taken X, working alone, to build all of the website?1. X built one part 15 minutes2. X built four times as many parts in 7 hours as Y built in 6 hoursA. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but... Categories : Odd and Even If a and b are positive integers, is ab even?1. a^b is odd2. a + b is evenA. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.AnswerRecall that the product of two integers is even if one or both of the integers are even. Therefore, ab is even if a or b is even. Statement 1 tells us that a^b is odd. Remember that the... Categories : Properties of Integers Is X an integer if AB > 0?1. X = 2A - 5B2. A = BA. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.AnswerIf A and B are both integers then 2A and 5yB are integers and thus X is an integer. If they are not integers, however, we have no guarantee that 2A - 5B will be an integer. ... Categories : Prime Numbers Is X, a prime number, equal to 41?1. X = A^2 + 5, where A is an integer2. X^2 > 1,000A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.AnswerWithout further information, we cannot definitively answer the question. Statement 1 alone is not sufficient to answer the question. Statement 2 tells us that X^2 > 1,... Categories : Number Properties If X is an integer, is Y an integer? 1. The average of X and Y is not an integer. 2. The average of X, Y, and X + 6, is Y. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient. Answer Since we can pick both integer and non-integer values for X that satisfy Statement 1,...

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