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Of the companies surveyed about the skills they require in prospective employees, 20% required both computer skills and writing skills.
What percent of the companies surveyed required neither computer skills nor writing 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.
OG给的解释如下，
The surveyed companies could be placed into one
of the following four categories:
1. Requiring computer skills and requiring writing
skills
2. Requiring computer skills but not requiring
writing skills
3. Not requiring computer skills but requiring
writing skills
4. Not requiring either computer skills or writing
skills
It is given that 20 percent of the surveyed
companies fell into category 1. It is necessary to
determine what percent of the surveyed
companies fell into category 4.
(1) This helps identify the percentage in
category 2. Since 1/2 the companies that required
computer skills also required writing skills
(i.e., those in category 1), then the other 1/2
of the companies that required computer skills
did not require writing skills (thus category 2 =
category 1). However, this information only
establishes that 20 percent required computer
skills, but not writing skills; NOT sufficient.
我想问下，解释里，Since 1/2 the companies that requiredcomputer skills also required writing skills
(i.e., those in category 1), then the other 1/2
of the companies that required computer skills
did not require writing skills (thus category 2 =
category 1). 这段不懂、。、、、、、标红的1/2哪里来的数字啊？？题目就说了20%啊。。。
望各位大牛给予详细解释。。。谢谢谢谢！！！
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发表于 2013-8-17 15:59:54
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