If x is an integer…
April 28, 2016
GMAT OFFICIAL GUIDE DS Solution: We need to determine whether 9^x + 9^-x = b. Statement One Alone: 3^x + 3^-x = √(b+2) We first square both sides of …
Tag: Official Guide for GMAT Review 2016
If a < x < b and c < y < d, is x < y
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We are given that a < x < b, and that c < y < d. We must determine whether x < y. Statement …
How many people are directors of both Company…
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We must determine how many individuals are directors for both Company K and Company R. To solve this “overlapping sets” problem, we can employ …
Robots X, Y, and Z each assemble components at their…
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We are given that r_x = the ratio of robot X’s constant rate to robot Z’s constant rate. If we let A = the …
What is the tenths digit in the decimal representation…
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We need to determine the value of the tenths place of a particular number. Statement One Alone: The number is less than 1/3. Since …
In a random sample of 80 adults, how many are college…
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We need to determine the number of college graduates in a sample of 80 adults. Because some of the 80 adults are college graduates, …
Can a certain rectangular sheet of glass be positioned…
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We need to determine whether a rectangular sheet of glass can cover an entire rectangular tabletop. We are given that the edges must be …
Is 4^(x + y) = 8^(10) ? (1) x – y = 9 (2) y/x = 1/4
October 31, 2015
GMAT OFFICIAL GUIDE DS Solution: We need to determine whether 4^(x+y) = 8^10. We start by breaking down our two bases into prime factors. 4^(x+y) = (2^2)^(x+y) = 2^(2x+2y) …