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题库 / OG2017Q-PS-146
On a certain transatlantic crossing, 20 percent of a ship's passengers held round-trip tickets and also took their cars aboard the ship. If 60 percent of the passengers with round-trip tickets did not take their cars aboard the ship, what percent of the ship's passengers held round-trip tickets?
33~$1 \over 3$~ %
40%
50%
60%
66~$2 \over 3$~ %
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假设共有乘客y人，其中拥有往返票的有x人
20 percent of a ship's passengers held round-trip tickets and also took their cars aboard the ship.，说明20%y=x
If 60 percent of the passengers with round-trip tickets did not take their cars aboard the ship, 所以40%*x是有往返票且带车上船的
所以20%y=40%x
x=1/2*y=50%y
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