gwd 1 11

Kath1985

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Q11:
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

Answer: D
[attachimg=720,450]78719[/attachimg]

passiona

横着看
0.5m + 0.4f = 0.42(m+f)

沉睡的巨人

可以算出来男女比例是1：4，答案就很明确了

Kath1985

還是算不出來 我頂多堆到0.5m+0.4M=0.42(M+F)