推 over1221:大感激 08/11 17:13
※ 引述《qqopqqop (p )》之銘言：
: In a corporation, 50 percent of the male employees and 40 percent
: of 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 female?
: 這題我想了好久可是還是沒算出來><
: 有人下可以幫我ㄧ下嗎
: 感激
設男生x人 女生y人
0.5x+0.4y=0.42(x+y)
所以8x=2y
男:女=1:4
所以女生占全部的4/5
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