2. 外语
  3. One day a car rental agency rented 2/3 of its cars, including 3/5 of its cars with CD players. If 3/4 of its cars have CD player

One day a car rental agency rented 2/3 of its cars, including 3/5 of its cars with CD players. If 3/4 of its cars have CD player

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问题 One day a car rental agency rented 2/3 of its cars, including 3/5 of its cars with CD players. If 3/4 of its cars have CD players, what percent of the cars that were not rented had CD players?
选项 A、10%
B、35%
C、45%
D、66.7%
E、90%
答案E
解析 One way to approach this problem is to think of the fractions as actual cars. Since the given denominators are 3, 4, and 5, imagine that there are 60 cars. In this case, the agency rented 40 cars (2/3), 45 of the total cars have CD players (3/4), and 27 of its cars with CD players were rented (3/5 of 3/4). From these numbers, we can determine that 20 cars in total were not rented, and 18 cars with CD players were not rented. 18 out of 20 is 90 percent.
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