Q10:

Was the average (arithmetic mean) weight of the package mailed at a certain post office yesterday greater than 600 grams?

(1) The total weight of the packages mailed at the post office yesterday was greater than 14,500 grams.

(2) Fewer than 25 packages were mailed at the post office yesterday.

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.

Answer: C

WHY NOT E？

是e，因为fewer than 25即是小于25 所以package最多只能是24个。

14500/24大于600