AMC8 2004

AMC8 2004 · Q7

AMC8 2004 · Q7. It mainly tests Percent, Rounding & estimation.

An athlete's target heart rate, in beats per minute, is 80% of the theoretical maximum heart rate. The maximum heart rate is found by subtracting the athlete's age, in years, from 220. To the nearest whole number, what is the target heart rate of an athlete who is 26 years old?

运动员的目标心率（每分钟跳动次数）为其理论最大心率的 80%。最大心率等于 220 减去运动员的年龄（年）。对于一名 26 岁的运动员，目标心率取整到最接近的整数是多少？

(A) 134 134

(B) 155 155

(D) 194 194

(E) 243 243

Answer

Correct choice: (B)

正确答案：（B）

Solution

(B) A 26-year-old’s target heart rate is $0.8(220-26)=155.2$ beats per minute. The nearest whole number is 155.

（B）一位 26 岁人的目标心率是 $0.8(220-26)=155.2$ 次/分钟。最接近的整数是 155。

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