求助一道模考DS题

lyjranchel

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.

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MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">【答案】A

 

MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">【思路】(1) totalMingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">（1400) x 42%=588(MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">參加人數） , 588 x womenMingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">比例（50%)=MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">參加女人的比例 , MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">充份  

        (2)MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">原題問surveyed werer women , MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">包含 engage MingLiU","serif"; mso-bidi-font-family: PMingLiU; mso-ascii-font-family: Tahoma; mso-hansi-font-family: Tahoma;">和 not engage , so we only can get engage women , 不充份

感觉对（1）的理解比较有问题，为什么588*50%=参加女人的比例呢？题目中说的意思是不是参加survey的男人36%和参加的女人的50%consider...

我列的式子是  36%M+50%F=1400*42%     光这个式子求不出M和F的具体数字来，还要（2）中条件即  36%M=288才能得出结果

不知道是哪里想错了，望NN指点！

meowlac

光要第一个就够了的  你忘记了   M+F=1400了  

[此贴子已经被作者于2009-5-11 17:34:40编辑过]

lyjranchel

啊...是哦

快要考试了，却越来越混乱。。。

meowlac

我后天  加油吧 哈哈~