GWD MATH 2 Q18 求解答

xianyunfeng · 发表于 2010-11-29 23:58:40

Q18:
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%

nafegogo · 发表于 2010-11-30 00:16:55

选C么LZ？
设总人数为x， round trip的人数为y, 求y:x
roundtrip且有车的人：
0.2x=y-0.6y
y:x=1:2

xianyunfeng · 发表于 2010-11-30 12:24:25

对阿。。答案是C。。谢谢阿。。我理解上出了点问题

GWD MATH 2 Q18 求解答

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