2007 AMC 12B 第 2 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
2.
一名大学生开小型车回家过周末，路程 英里，平均每加仑行驶 英里。返程时他开父母的 SUV，平均每加仑只能行驶 英里。往返全程平均每加仑行驶多少英里？
A college student drove his compact car miles home for the weekend and averaged miles per gallon. On the return trip the student drove his parents’ SUV and averaged only miles per gallon. What was the average gas mileage, in miles per gallon, for the round trip?
小提示：
平均油耗是总英里数除以总加仑数，而不是两个速率的平均。
Average mileage is total miles divided by total gallons, not the average of the two rates
大提示：
小车用 加仑，SUV 用 加仑。
The car uses gallons and the SUV uses gallons
解答：
去程用 加仑，返程用 加仑。
往返共 英里，用油 加仑，所以平均每加仑行驶的英里数为
所以正确答案是 B。
The trip home uses gallons, and the return trip uses gallons.
The round trip covers miles on gallons, so the average is
Thus, the correct answer is B.
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