作者Ph7 (褪去色彩脱胎重生)
看板GRE_Verbal
标题[计量] If 55 percent of people have brown hair and 80 percent o
时间Sun Nov 30 14:28:13 2008
1. If 55 percent of a group of peopole have brown hair and 80 percent
of the same group do not have red hair, what fraction of those who
do not have brown hair have red hair???
A.1/4
B.4/11
C.4/9
D.5/9
E.4/5
题意不是很请清楚
请大大帮个忙解释一下
ANS: C
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1F：→ a777starmy :大於0.45的答案可以先删去了，先用删去法^^ 12/11 17:45