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标题: 求助一道数学···· [打印本页]

作者: saiko13    时间: 2010-10-29 20:13
标题: 求助一道数学····
On a certain transatlantic crossing 20% of a ship's passengers held round-trip tickets and also took their cars abroad the ship. if 60% of hte passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship passengers held round-trip tickets?
A 33又1\3
B 40%
C 50%
D 60%
E 66又2\3

我的理解是 在某个横渡大西洋的横渡中,20%的乘客选择的是往返票并携带他们的汽车。如果有60%的人是往返票但没有携带汽车,那么有多少百分比的乘客是往返票?
怎么做?对于这种比例的问题,我一直都很棘手,有哪位大侠能帮忙总结一下,遇到这一类型的题目应该怎么想。谢谢解答

作者: gaor    时间: 2010-10-29 20:31
假设一共100人,由题可知20人持往返票和汽车
已知持往返票的人当中 60%没有车, =〉40%有车
20/40%=50




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