Question

Julie 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 $150$ 个词。如果 Julie 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 $150$ 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?

$2250$

$3000$

$4200$

$4350$

$5650$

答案：E

知识点：速率单位换算

难度评级：660

解答：

半小时是 $30$ 分钟，Julie 可说个词。四分之三小时是 $45$ 分钟，可说个词。选项中唯一在四千五百和六千七百五十之间的是 $5650$ 。 $150 \cdot 30 = 4500$ $150 \cdot 45 = 6750$

所以正确答案是 E。

One-half hour is $30$ minutes, in which Julie can speak $150 \cdot 30 = 4500$ words. Three-quarters of an hour is $45$ minutes, in which Julie can speak $150 \cdot 45 = 6750$ words. The only answer choice in between these two values is $5650.$

Thus, E is the correct answer.

1997 AMC 8 第 4 题

答案：E

难度评级：660

解答：

其他年份的第 4 题