prep老题求解答~

frankzhiwei · 发表于 2010-11-24 11:31:32

165.16466-!-item-!-187;#058&010795

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.

--------------------------------------------------------------------------------------------------------------------------------------------------------【答案】A

【思路】(1) total（1400) x 0.42 =588(參加人數） , 588 x women比例（0.5 )=參加女人的比例 , 充份

(2)原題問surveyed werer women , 包含 engage 和 not engage , so we only can get engage women , 不充份

那个分析是不是错了呀，为什么乘以0.5就是女人人数呀？

【思路】(1) total（1400) x 0.42 =588(參加人數） , 588 x women比例（0.5 )=參加女人的比例 , 充份

(2)原題問surveyed werer women , 包含 engage 和 not engage , so we only can get engage women , 不充份

那个分析是不是错了呀，为什么乘以0.5就是女人人数呀？

yiyisue · 发表于 2010-11-24 12:27:13

没错，因为（1）里给出的女人比例是50%。lz可以这样理解：设一共有x女人，则一共有1400-x男人，由（1）可得：36%*（1400-x）+50%x=42%*1400。就是给出解释的变形

wljwendycyu · 发表于 2013-12-20 21:16:02

嗯同意。可解出：参加调查的男人有800 女人有600

prep老题求解答~

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块