GRE- Quantitative Reasoning
D. The relationship cannot be determined from the information given.

Answer(s): B
Explanation: You can approach this problem intuitively, without a written system of equations. If
P's age were twice what R's age is now, then Q's age would equal R's age, and the correct
answer would be choice (C). R's current age must be greater than half of P's (because one year
ago R's age was exactly half of P's). Given that Q's age is exactly half of P's age, R must be
older than Q.
QUESTION: 36

A. The quantity in Column A is greater;
B. The quantity in Column B is greater;
C. The quantities are equal;
D. The relationship cannot be determined from the information given.

Answer(s): D
Explanation: The inequality ab < 0 tells you that either a or b, but not both, is negative. Since a
< b, a must be negative and b must be positive. But you cannot make the comparison between
Quantity A and Quantity B. Which is greater depends on the absolute values of the two
variables. For example, if a = -1 and b = 2, then
On the other hand, if a = -2 and b = 1, then

QUESTION: 37

A. The quantity in Column A is greater;
B. The quantity in Column B is greater;
C. The quantities are equal;
D. The relationship cannot be determined from the information given.

Answer(s): D
Explanation: In the distribution described in Column B, if the third term is the precise average
(arithmetic mean) of the other two terms, then Quantity A would equal Quantity B (for example, if

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