Difficult Data Sufficiency Questions

WXYZ Remainder

If w, x, y, and z are the digits of the four-digit number N, a positive integer, what is the remainder when N is divided by 9?

1) w + x + y + z = 13 2) N + 5 is divisible by 9 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) Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.

View Answer and Explanation

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test Copyright © 2009 PlatinumPrep, LLC. May be distributed freely, but not modified.

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test 4 Powerful XYs If x and y are distinct positive integers, what is the value of x4 - y4?

1) (y2 + x2)(y + x)(x - y) = 240 2) xy = yx and x > 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) Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.

View Answer and Explanation

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test Copyright © 2009 PlatinumPrep, LLC. May be distributed freely, but not modified.

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test

Counting 9s

If z = xn - 19, is z divisible by 9? 1) x = 10; n is a positive integer 2) z + 981 is a multiple of 9

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) Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.

View Answer and Explanation

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test Copyright © 2009 PlatinumPrep, LLC. May be distributed freely, but not modified.

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test Even Prime Addition Mystery x is a positive integer; what is the value of x? 1) The sum of any two positive factors of x is even 2) x is a prime number and x < 4

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) Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.

View Answer and Explanation

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test Copyright © 2009 PlatinumPrep, LLC. May be distributed freely, but not modified.

GMAT Practice Questions | GMAT Study Guide | Free GMAT Prep www.platinumgmat.com | GMAT Practice Test X Mystery What is the value of x? 1) The average (arithmetic mean) of 5, x2, 2, 10x, and 3 is -3 2) The median of 109, -32, -30, 208, -15, x, 10, -43, 7 is -5

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....