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标题: 在请教GWD-6-14 [打印本页]

作者: migei 时间: 2005-1-31 12:53 标题: 在请教GWD-6-14

Q14:

If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?

A. 40

B. 45

C. 60

D. 75

E. 95

作者: sammen 时间: 2005-1-31 21:57

答案是E啊,(X+Y+20)/3=(X+Y+20+30)/4+10

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