哪位好人帮帮忙阿！看下这道数学题 谢谢！！！

harlow

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?



这题怎么做？

lovesasa0820

50%？

pipilovelail

80%对吗？

harlow

是５０％．．．怎么做啊

lovesasa0820

画个韦氏图
别被里面的信息搞晕

harlow

80%对吗？

-- by 会员 pipilovelail (2009/11/29 15:15:33)

是５０％．．．忘了怎么做了

harlow

画个韦氏图
别被里面的信息搞晕

-- by 会员 lovesasa0820 (2009/11/29 15:47:24)

画了　然后晕了．．．

lovesasa0820

我试着解释下。。
占总数20%的人有票也停车，有票的人里60%人没took their cars abroad the ship，也就是说40%人took their cars abroad the ship了
也就是说3：2=占总数30%：占总数20%
held round-trip tickets：20%+30%

harlow

我试着解释下。。
占总数20%的人有票也停车，有票的人里60%人没took their cars abroad the ship，也就是说40%人took their cars abroad the ship了
也就是说3：2=占总数30%：占总数20%
held round-trip tickets：20%+30%

-- by 会员 lovesasa0820 (2009/11/29 15:54:21)

噢　也就是说那６０％是２０％里面的对伐

celineyo

30%是哪来的呢……