1994 AMC 8 第 14 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。
14.
pairball 每次可以由两个孩子玩。 分钟内始终只有两个孩子同时在玩，五个孩子轮流上场，使每个人玩的时间相同。每个孩子玩了多少分钟？
Two children at a time can play pairball. For minutes, with only two children playing at one time, five children take turns so that each one plays the same amount of time. The number of minutes each child plays is
答案：E
小提示：
两个孩子玩满 分钟，所以总游戏时间是 个“孩子分钟”
With two children playing for the whole minutes, the total playing time is child-minutes
大提示：
把总游戏时间平均分给 个孩子
Divide the total playing time equally among the children
解答：
任意时刻都有两个孩子在玩，共 分钟，所以总游戏时间是 个孩子分钟。
平均分给 个孩子，每个孩子玩 分钟。
所以正确答案是 E。
Two children play at every moment for minutes, so the total playing time is child-minutes.
Split equally among children, each plays minutes.
Thus, the correct answer is E .
其他年份的第 14 题
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