数学OG13题目求解

cherryfish1209 · 发表于 2014-5-9 19:33:02

Of the companies surveyed about the skills theyrequired in prospective employees, 20 percentrequired both computer skills and writing skills. Whatpercent of the companies surveyed required neithercomputer skills nor writing skills?
- (1) Of those companies surveyed that requiredcomputer skills, half required writing skills.
- (2) 45 percent of the companies surveyed requiredwriting skills but not computer skills.
  
  OG里面的题目，DS题目，怎么理解(1)呢。。。。为什么OG解释require computer skills but not writing skills的部分是20%呢？？按照1的意思，应该为45%（writing skills）的两倍（90%）啊

wwdenv · 发表于 2014-5-9 20:25:09

(1) Of those companies surveyed that requiredcomputer skills, half required writing skills. 意思就是要求会computer的公司中，有一半公司还要求会writing，也就是说这一半公司既要求会电脑又要求会写作，也就是主题干提到的那 20 percentrequired both computer skills and writing skills。那么只要求会写作就是另一半20%。
这道题用维恩图容易帮助理解。

cherryfish1209 · 发表于 2014-5-9 22:30:40

wwdenv 发表于 2014-5-9 20:25
(1) Of those companies surveyed that requiredcomputer skills, half required writing skills. 意 ...

明白了！谢谢！

wwdenv · 发表于 2014-5-9 22:44:28

cherryfish1209 发表于 2014-5-9 22:30
明白了！谢谢！

不客气。意识到写错了一句。应该是“只要求会电脑的就是另一20%”。

数学OG13题目求解

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