没人问得笨笨题！GWD19-4

Q4:

On a given day, 50 people took a test that is designed to measure a candidate’s aptitude.  Some of the 50 people will take the test in the morning, and the remaining of the 50 people will take the test in the afternoon.  What is the average (arithmetic mean) score on the test for the 50 examinees?

(1)   The average score for the examinees who take the test in the morning was 68.2.

(2) The average score for the examinees who take the test in the afternoon was 74.3.

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

笨题就笨人来问吧：答案是E   WHY NOT C??   这种题我居然一向都是两个加起来除与2！ 错了吧？

sorry 不知道也没关系把？ 反正他们加起来都是50  所以两个的和直接除2不就行了么 ？

one person takes in the morning and his score is 5

two persons take in the afternoon, one gets 10, the other gets 20, the average is 15

(5+15)/2=10

(5+10+20)/3=....

which one is right?

这样的。。。 那么我从来都想错了。。。。的确笨！

thank you ^-^