急问一道数学jj,谢谢~

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bhcrystal

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发表于 2009-9-9 16:39:00 | 显示全部楼层

急问一道数学jj,谢谢~

1. PS: (General meaning, not accurate) 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% respectively (numbers may not be accurate). The percentage of A and B is 30%, what is the maximum number of C only without neither A nor B.

请问是得480吗？