【GMAT考满分数学PS题库】If the average (arithmetic mean) of x, y, and 20 i_真题_答案_解析 GMAT考满分官网

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题目内容

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?

A40
B45
C60
D75
E95

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正确答案: E

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