请教一道数学题！！纠结

q8225800 · 发表于 2010-4-13 21:47:54

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?答案50%怎么算的呀题目是怎么理解的呀谢谢！

yuweiusa · 发表于 2010-4-14 06:02:43

在所有乘客中有20%的乘客既有往返票又有车在船上在有往返票的乘客有60%没有车在船上

yanghaoran · 发表于 2010-4-14 12:50:07

总数中有票既有车的为a，只有票的为b,根据题意，（1-60%）b就是有票既有车的，
所以20%a=40%b b/a=50%

q8225800 · 发表于 2010-4-14 23:25:26

请教一道数学题！！纠结

谢谢你了！！

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