作者flac (老狮子)
看板GMAT
标题Re: [计量] 问题 数学狒狒1
时间Mon Aug 11 12:13:33 2008
※ 引述《qqopqqop (p )》之铭言：
: 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?
: 这题我想了好久可是还是没算出来><
: 有人下可以帮我ㄧ下吗
: 感激
设男生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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1F：推 over1221:大感激 08/11 17:13