1994 AMC 8 第 17 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。
17.
Pauline Bunyan 第一小时可以铲 立方码雪，第二小时铲 立方码，第三小时铲 立方码，依此类推，每小时都比上一小时少铲一立方码。如果她的车道宽 码、长 码，并被 码深的雪覆盖，那么她铲干净大约需要多少小时？
Pauline Bunyan can shovel snow at the rate of cubic yards for the first hour, cubic yards for the second, for the third, etc., always shoveling one cubic yard less per hour than the previous hour. If her driveway is yards wide, yards long, and covered with snow yards deep, then the number of hours it will take her to shovel it clean is closest to
小提示：
先求雪的总体积： 立方码
First find the total volume of snow:
大提示：
逐小时累加 ，直到累计量达到雪的体积
Add hour by hour until the running total reaches the volume
解答：
雪的体积是 立方码。
累计铲雪量是 立方码，也就是 小时的工作量。第八小时的铲雪速度是每小时 立方码，因此剩下的一立方码需要 小时。准确时间是 小时，最接近 小时。
所以正确答案是 D。
The volume of snow is cubic yards.
The amounts shoveled add up to after hours. In the eighth hour her rate is cubic yards per hour, so the last cubic yard takes hour. The exact time is therefore hours, which is closest to .
Thus, the correct answer is D .
其他年份的第 17 题
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