GWD21-23

meckychen

Q23:

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%

Answer: C  How to calculate? Thanks

a10285

关键是阅读
20%的旅客  有往返票  并  往返
60%的有往返票的旅客   不往返  ，因此40%的有往返票的旅客 往返
20%/40%=50%

meckychen

Thanks

moi023399

的确，设有往返票的人数为R，船上总人数为T，以带车的人数建立关系：

(1-0.6)R=0.2T => R/T=0.5