请教一道数学JJ~T.T

bhcrystal

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. 答案312

不会做。。。。。。。请大家帮忙，谢谢！

minatong

画韦恩图，因为求最大解，所以就是ABC都参加的人数是0

whatsmylife

记得答案应该是480吧...

pilip

480

guoyun622

题干数字有问题`应该是56,48,42 ``结果是312`