求助：
12版OG，诊断测试，25页第34题。
34. Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of the companies surveryed requried neither computer skills nor woring skills?
(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but not computer skills.
我看了OG 的解答，看了好几遍还是没有弄明白：
(1) Of those companies surveyed that required computer skills, half required writing skills.
这句的意思是：“要求员工掌握电脑技能的公司里，有一半要求写作技能。”吗？
如果是的，为什么解答中说要求电脑技能和写作技能的人数一样，都是20%呢？
看不懂啊……求解答！！大菜鸟谢谢各位了……作者: EGHJUYMN 时间: 2010-8-6 06:32
(1) alone can only tell the 20% of total employees who are both C and W is half of the C(only C and C+W). This is only 40%, could not tell the other 60%
(2) alone neither can tell
But is (1) and (2), 20%(only C) + 20%(both C and W) +45%(only W) =85%<100%
so , neither C nor W will be 1-85%=15%.
The key to answer this Q is convert the half to be 0.5 then with the 20% of total to deduce the 40%.
Hope it helps. 如果有问题， 请继续问。我都在努力。一起加油作者: zcooles 时间: 2010-8-9 06:31
谢谢大侠们！！！！！！！！！！！！
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