2011 AMC 8 第 6 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
6.
一个镇上有 名成年人，每个成年人拥有汽车、摩托车，或两者都有。若 名成年人拥有汽车， 名成年人拥有摩托车，那么有多少名汽车拥有者不拥有摩托车？
In a town of adults, every adult owns a car, a motorcycle, or both. If adults own cars and adults own motorcycles, how many of the car owners do not own a motorcycle?
答案：D
小提示：
从成年人总数中减去拥有摩托车的人数
Subtract the motorcycle owners from the total adults.
大提示：
不拥有摩托车的成年人正好就是不拥有摩托车的汽车拥有者
The adults without motorcycles are exactly the car owners who do not own a motorcycle.
解答：
已知有 人拥有摩托车，所以 人不拥有摩托车。
所以正确答案是 D。
We know that people own motorcycles, so people do not own motorcycles.
Thus, D is the correct answer.
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