问一题

evelyn205205

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?

A.33 1/3%

B.40%

C.50%

D.60%

E.66 2/3%

ANSWER: C 我想知道是不是题目出错了，应该问的的是乘客中有百分之多少的人有单程票。对么？

沉睡的巨人

是C，20%是相对所有乘客的，60%是有round-trip的乘客的，由60%可以知道有round-trip的乘客中把车带上ship的是40%（40%也是相对于round乘客的），这样所有乘客的20%就等于round乘客的40%（这里的等量关系是通过有round且把车带上船的人），那么round/all=20%/40%=50%

evelyn205205

谢谢这位牛牛，我了咯~