1997 AMC 8 第 4 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。
4.
朱莉正在为班级准备演讲。她的演讲必须持续半小时到四分之三小时之间。理想语速是每分钟 个词。如果朱莉按理想语速演讲，下列哪个词数适合作为她演讲的长度？
Julie is preparing a speech for her class. Her speech must last between one-half hour and three-quarters of an hour. The ideal rate of speech is words per minute. If Julie speaks at the ideal rate, which of the following number of words would be an appropriate length for her speech?
小提示：
把分钟数的上下界乘以每分钟 个词
Multiply the minute bounds by words per minute
大提示：
把这段时间范围换算成分钟
Convert the time range into minutes
解答：
半小时是 分钟，朱莉可以说 个词。四分之三小时是 分钟，她可以说 个词。选项中唯一介于这两个数之间的是 。
所以正确答案是 E。
One-half hour is minutes, in which Julie can speak words. Three-quarters of an hour is minutes, in which Julie can speak words. The only answer choice in between these two values is
Thus, E is the correct answer.
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