【GMAT考满分数学PS题库】Given that a is the average (arithmetic mean) of t_真题_答案

Manhattan - 数学PS - 12

题目内容

Given that a is the average (arithmetic mean) of the first nine positive multiples of six and b is the median of the first twelve positive multiples of six, what is the ratio of a to b?

A3:4
B10:13
C5:6
D13:10
E4:3

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正确答案: B

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