289 版　４2　题

zmeric · 发表于 2009-9-6 16:23:00

295.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.

答案是480么？　　１－５４％－３６％＋３０％＝４０％　１２００＊０．４＝４８０

请确认下ＴＨＸ

zhongtiangg · 发表于 2009-9-6 17:26:00

absolutely

zmeric · 发表于 2009-9-6 17:30:00

ＴＨＸ　ＳＯ　ＭＣＵＨ

kevinli120 · 发表于 2009-9-6 17:35:00

没看懂，能再解释清楚点么？42%岂不是没有用

kevinli120 · 发表于 2009-9-6 17:36:00

The percentage of A and B怎么理解呢？

whatsmylife · 发表于 2009-9-6 17:58:00

同意480，同时回5楼，即包含于A也包含于B，就相当于种树，即种了A又种了B的意思

kevinli120 · 发表于 2009-9-6 18:03:00

以下是引用whatsmylife在2009/9/6 17:58:00的发言：

同意480，同时回5楼，即包含于A也包含于B，就相当于种树，即种了A又种了B的意思

The percentage of A and B是 A并B 还是 A交B 啊？谢谢

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