GWD 第二套 18题求解

luyi1988 · 发表于 2010-7-5 16:18:10

On a certain transatlantic crossing, 20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?

33 1/3%
40%
50%
60%
66 2/3%

答案是C，我觉得20%+60%不就是答案了？

Nickyl86 · 发表于 2010-7-5 16:46:27

设有回程票的人数是x，没有的是y，则题目求的是x/(x+y)=?
根据题意20%(x+y)=(1-60%)x，得到x/(x+y)=20%/40%=0.5=50%

luyi1988 · 发表于 2010-7-5 17:37:23

rainny0906 · 发表于 2010-7-5 20:05:36

偶是新手，求教楼主，能否把GWD全套发给我一份，在GWD专区下载的东西有密码，试了几次都不成功，多谢啦!
请发至rainny0906[在] live.cn

GWD 第二套 18题求解

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