GRE- Quantitative Reasoning
Explanation: First, Quantity A: The greatest common factor of 20,45, and 90 is 5. As for
Quantity B, the sum of the three numbers given is clearly greater than 5. That's all you need to
know to conclude that Quantity B is greater than Quantity A and that the correct answer is
choice (B).
QUESTION: 54

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: Quantity A =
Quantity B = .078x. The comparison, then, is between
and .078x. If x happens to equal
then both quantities would equal 1. Otherwise, the
two quantities are unequal; in fact, they're reciprocals. (Their product is 1.) For example, if x = 1,
then Quantity A is a fraction greater than 1 by an order of more than 10, while Quantity B is a
fraction less than 1 by the same order. That is all you need to know to conclude that choice D. is
correct.
QUESTION: 55

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: If P <0 such that P+Q > 0, then QuantityA < QuantityB . On the other hand, if P+Q
< 0, then Quantity A = Quantity B.
QUESTION: 56

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