【GMAT考满分数学PS题库】A has worked for 18 hours and B has worked for 6 h_真题_答案_解析 GMAT考满分官网

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A has worked for 18 hours and B has worked for 6 hours. A is three times more efficient than B. So , what the fraction of (A + B) 's total workload is B's total workload ?

A1/2
B1/3
C1/5
D1/10
E1/12

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正确答案: D

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