1992 AMC 8 第 12 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。
12.
一辆车的五个轮胎（四个行驶轮胎和一个全尺寸备胎）进行轮换，使得汽车行驶前 英里期间每个轮胎使用的里程数相同。每个轮胎使用了多少英里？
The five tires of a car (four road tires and a full-sized spare) were rotated so that each tire was used the same number of miles during the first miles the car traveled. For how many miles was each tire used?
答案：C
小提示：
任意时刻有 个轮胎在地面上，而轮胎共有 个，所以总轮胎里程为 。
At any moment of the tires are on the ground, so the total tire-mileage is
大提示：
把这个总轮胎里程平均分给 个轮胎。
Share that total tire-mileage equally among the tires
解答：
在 英里的行驶中，始终有 个轮胎在使用，所以总轮胎里程为 轮胎英里。
平均分给 个轮胎，每个轮胎使用 英里。
所以正确答案是 C。
During the miles, tires are always in use, so the total tire-mileage is tire-miles.
Split equally among tires, each tire is used miles.
Thus, the correct answer is C .
其他年份的第 12 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1993 AMC 8
- 1994 AMC 8
- 1995 AMC 8
- 1996 AMC 8
- 1997 AMC 8
- 1998 AMC 8
- 1999 AMC 8
- 2000 AMC 8
- 2001 AMC 8
- 2002 AMC 8
- 2003 AMC 8
- 2004 AMC 8
- 2005 AMC 8
- 2006 AMC 8
- 2007 AMC 8
- 2008 AMC 8
- 2009 AMC 8
- 2010 AMC 8
- 2011 AMC 8
- 2012 AMC 8
- 2013 AMC 8
- 2014 AMC 8
- 2015 AMC 8
- 2016 AMC 8
- 2017 AMC 8
- 2018 AMC 8
- 2019 AMC 8
- 2020 AMC 8
- 2022 AMC 8
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- 2026 AMC 8