作者pilichat (人生需要不断冒险)
看板GMAT
标题[计量] 09版 3
时间Fri Sep 11 15:28:34 2009
3.There are 1,200 respondents in a survey.
And they are divided into three groups,
such as A, B and C with percentage of
54%, 36% and 42%(数字抄的梦飞翔的，感觉好像有点出入)
respectively (numbers may not be accurate).
The percentage of A and B is 30%,
what is the maximum number of C that is neither in A nor B.
这类题目列式怎麽列？
感谢～
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1F：推 giyoshi:我算是480 @@"..... 09/11 15:37
2F：推 giyoshi:算法是1200 X %数 得出A B C 与 A交集B 然後用 09/11 15:41
3F：→ giyoshi:全部扣掉A联集B 09/11 15:41