AMC8 1997

AMC8 1997 · Q4

AMC8 1997 · Q4. It mainly tests Averages (mean), Rates (speed).

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 appropriate length for her speech?

Julie 正在为她的班级准备演讲。她的演讲必须持续在半小时到四分之三小时之间。理想的演讲速度是每分钟 150 词。如果 Julie 以理想速度演讲，下列哪个词数适合她的演讲长度？

(A) 2250 2250

(B) 3000 3000

(D) 4350 4350

(E) 5650 5650

Answer

Correct choice: (E)

正确答案：（E）

Solution

Half hour: \(30 \times 150 = 4500\) words; three-quarters hour: \(45 \times 150 = 6750\) words. Only 5650 is in between.

半小时：\(30 \times 150 = 4500\) 词；四分之三小时：\(45 \times 150 = 6750\) 词。只有 5650 在之间。

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