GMAT考题：OG2017Q-DS-193

GMAT考题

What is the value of ~$r \over 2$~+~$s \over 2$~ ?

(1)~$r+s \over 2$~=5

(2) r + s = 10

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

毕出

题目分析：

（1）~$\frac{r+s}{2}=\frac{r}{2}+\frac{s}{2}=5$~ ，题目得解。

（2）由r + s=10得~$\frac{r+s}{2}=5$~，所以有~$\frac{r+s}{2}=\frac{r}{2}+\frac{s}{2}=5$~

因此，本题答案为（D），任何一个条件说明均能解题。

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