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题目内容 （请给出正确答案）
单选题
If the average (arithmetic mean) of a, b, 4, and 10 is 8, what is the value of a + b?
A

4

B

6

C

9

D

15

E

18

参考答案

参考解析
解析：
根据题干可得出(a+ b + 10 + 4)/4=8，a + b=18。
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