问题 单项选择题

On a recent trip, Cindy drove her car 290 miles, rounded to the nearest 10 miles, and used 12 gallons of gasoline, rounded to the nearest gallon. The actual number of miles per gallon that Cindy’s car got on this trip must have been between ?()

A.A

B.B

C.C

D.D

E.E

答案

参考答案:D

解析:

to the nearest指四舍五入,根据四舍五入的定义,可知C开车的实际英里数应在285至295英里之间,而使用的汽油加仑数应在11.5至12.5加仑之间,所以Cindy每加仑汽油所行驶的英里数的范围应在最小英里数除以最大加仑数与最大英里数除以最小加仑数之间,即:

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判断题
单项选择题 B型题