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math question

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楼主
发表于 2011-3-23 16:14:55 | 只看该作者 回帖奖励 |正序浏览 |阅读模式
Of the 1,400 college teachers surveyed, 42 percent said that they considered engaging in research an essential goal.  How many of the college teachers surveyed were women?

(1) In the survey, 36 percent of the men and 50 percent of the women said that they considered engaging in research an essential goal.

(2) In the survey, 288 men said that they considered engaging in research an essential goal.

why A

1400*42%*50% is the women engaged, not all surveyed...脑子短路了.. thanks...
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沙发
发表于 2011-3-23 16:23:07 | 只看该作者
x+y =1400
0.36x+0.5y=1400*0.42
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