GWD－17－10想不明白，大家帮帮忙行吗

jasdesky

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.

答案是C：两个条件加起来只能求出每包的重量大于等于580，那怎么能够回答是否大于600的问题呢？如果大于600，那就是是，但是如果介于580和600当中，不就是否了吗？

Thanks

barrios

fewer than 25, so 24 is max, 1450/24 >600