2007 AMC 8 第 1 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。
1.
Theresa 的父母同意，如果她平均每周花 小时帮忙做家务，连续 周，就给她买票去看她最喜欢的乐队。前 周她分别帮忙 、、、 和 小时。为了得到门票，最后一周她必须工作多少小时？
Theresa’s parents have agreed to buy her tickets to see her favorite band if she spends an average of hours per week helping around the house for weeks. For the first weeks she helps around the house for and hours. How many hours must she work for the final week to earn the tickets?
答案：D
小提示：
求六周总共需要多少小时
Find the total number of hours needed over all six weeks.
大提示：
将这个总数与 Theresa 前五周已经工作的小时数比较
Compare that total with the hours Theresa already worked in the first five weeks.
解答：
前 周 Theresa 总共工作 小时。
她承诺总共工作 小时。
因此她最后一周必须工作 小时才能得到门票。
所以正确答案是 D。
During the first weeks, Theresa works for a total of hours.
She promised to work hours in all.
This means that she has to work hours during the final week to earn the tickets.
Thus, D is the correct answer.
其他年份的第 1 题
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