gabriel_djh

问下这题答案是多少啊
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又1/3 %
B. 40%
C. 50%
D. 60%
E. 66又2/3%

gabriel_djh

哦，它说有往返票的人中，百分60没车的，那百分之40就是有车的，那不就等于前面全部游客的百分之20么，两个假设前面是a，后面全体乘客为B 是不是就是 2a=b，就是百分之50，不知道我这么算对不对，高手指教