GMAT申友问题求解PS题库-In a corporation, 50 percent of the male employees and 40 percent of the female employees are at least 35-GWD

本题由chris提供

In a corporation, 50 percent of the male employees and

40 percent of the female employees are at least 35 years old. If 42 percent of all the employees are at least 35 years old, what fraction of the employees in the corporation are females?

A. 3/5

B. 2/3

C. 3/4

D. 4/5

E. 5/6

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答案：

如果男性

员工中的50% 和女性员工中的40% 都是至少35岁的如果所有员工中有42%都是35岁以上的，问员工当中有多少是女性？

(50%M+40%F)/(M+F)=42%

0.5M+0.4F=0.42M+0.42F

0.08M=0.02F

4M=F

F/(M+F)=F/(0.25F+F)=4/5

选D

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