SAT考试9月每日精选题（54）

>>SAT考试练习：SAT考试9月每日精选题（54）

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Read the following SAT test question and thenclick on a button to select your answer.

Hareg's motorcycle uses 1 gallon of gas for every 30miles traveled when traveling at an average speed of60 miles per hour. The motorcycle's gas tank has 5 gallons at the beginning of a trip. If Hareg'smotorcycle travels at an average speed of 60 miles per hour, which of the following functionsbest models the number of gallons of gas, g(h), remaining in the tank h hours after the tripbegins?

A.g(h)=5-2h

B.g(h)=5-h/2

C.g(h)=(5-60h)30

D.g(h)=(5-30h)/60

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答案：A

解析：

Choice A is correct. Since Hareg's motorcycle travels at an average speed of 60 miles per hour and the motorcycle's gas mileage is 30 miles per gallon.

Therefore, the motorcycle uses 2h gallons of gas in h hours.

Since the motorcycle's gas tank has 5 gallons of gas when the trip begins, we can represent the total amount of gas in the tank, g(h), after h hours of driving during which the motorcycle uses 2 h gallons of gas per hour can be represented with the following equation

g(h)=5-2h

The function that best models the amount of gas, g(h), in the tank after h hours of driving is g(h)=5-2h.

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