Did the sum of the prices of three shirts exceed $60?

1. The price of the most expensive of the shirts exceeded $30.

2. The price of the least expensive of the shirts exceeded $20.

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.

Correct Answer: B

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For which of the following functions is f(a+b) = f(b) + f(a) for all positive numbers a and b?

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This is one of the most difficult questions in the GMAT universe. That said, there is a simple way to solve it that relies on a fundamental divisibility rule every GMAT studier should know:

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