作者bluecsky (我要蓝蓝淡淡的天空)
看板GRE_Verbal
标题Re: [计量] 被搞昏头了，求救
时间Fri Jun 6 10:26:15 2008
※ 引述《aggiemaxie (Maxie)》之铭言：
: If 55% of a group of people have brown hair and 80% of the same group do
: NOT have red hair, what fraction of those who do NOT have brown hair have
: red hair?
: from pp3....
: I got confused~@@
brown hair : 55% - > do not have brown hair : 45%
do not have read hair : 80% -> read hair : 20%
farction of those do not have brown hair have read hair
20%/45% = 4/9...答案是这样吗?
--
上帝曾经说过 :
当一个人打你右脸的时候
你就要用
日耳曼背桥摔坏它的左脸
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※ 编辑: bluecsky 来自: 118.160.236.91 (06/06 10:26)