GWD第二套18题求助

猫猫咪伢 · 发表于 2011-9-10 22:14:15

Q18:

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?

A.33 1/3%

B.40%

C.50%

D.60%

E.66 2/3%
我对题目意思理解不明白，我的理解结果是20%+60%，当然肯定没那么简单，求求各位指导一下。拜谢！

线香花火 · 发表于 2011-9-10 22:17:49

设全体passenger有X人
有round-trip tickets 得有Y人
那么就可以列式
20%X=40%y
求的是Y/X
倒一下就可以了
记得把60%转换成对立的40%就好

猫猫咪伢 · 发表于 2011-9-10 22:21:02

噢~明白。谢啦~~

GWD第二套18题求助

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