GWD10-11

[pinglee1984]

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

Ans:D


麻煩大家囉....我一直算不出來....謝謝大家.....

[Isabelle]

設F是女性員工所佔的比例，則男性員工的比例為1-F
(1-F)*50%+F*40% = 1*42% ==> F=4/5

[pinglee1984]

太感激了.....