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