On a certain transaltatic 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 roung-trip tickets did not take their cars abroad the ship, what percent of the ship's passengers held round-trip tickets?
1) 33 1/3%
2) 40%
3) 50%
4) 60%
5) 66 2/3%
Please help!! thank you!!
作者: sammen 时间: 2005-10-10 14:46
(100%-60%)*R( passengers with round tickets)=20%*Total passengers作者: sammen 时间: 2005-10-10 14:47
做这个题目最好画图,一画就明白了.
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