单选题If the average (arithmetic mean) of a, b, 4, and 10 is 8, what is the value of a + b?A4B6C9D15E18
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
参考解析
解析：
根据题干可得出(a+ b + 10 + 4)/4=8，a + b=18。
根据题干可得出(a+ b + 10 + 4)/4=8，a + b=18。
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