求教一道PREP的DS

janetking

of the 1400 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% of the men and 50%of the women said that they considered engaging in essential goals.
2 in the survey,288 men said that they considered engaging in research  an essential goal.  
答案是A 我選了D  請高手指教。

beijin111

今天刚做到
设男m人女w人
由1     36%m+50%w=1400*42%
          m+w=1400
解方程组

而2     只能算出congsider engage的女性有多少个，但无从得知被调查的人中共有多少是女性

janetking

今天刚做到
设男m人女w人
由1     36%m+50%w=1400*42%
          m+w=1400
解方程组

而2     只能算出congsider engage的女性有多少个，但无从得知被调查的人中共有多少是女性

-- by 会员 beijin111 (2010/8/25 12:22:14)

原來是這樣。我把共有的女性和engage的女性混為一談了。 謝謝啦。