Question

Theresa 的父母同意，如果她连续 $6$ 周平均每周花 $10$ 小时帮忙做家务，就给她买票去看她最喜欢的乐队。前 $5$ 周她分别帮忙 $8$ 、 $11$ 、 $7$ 、 $12,$ 和 $10$ 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 $10$ hours per week helping around the house for $6$ weeks. For the first $5$ weeks she helps around the house for $8,$ $11,$ $7,$ $12$ and $10$ hours. How many hours must she work for the final week to earn the tickets?

$9$

$10$

$11$

$12$

$13$

答案：D

知识点：平均数

难度评级：560

解答：

前 $5$ 周 Theresa 总共工作 $8+11+7+12+10=48$ 小时。

她承诺总共工作 $10\cdot 6=60$ 小时。

因此她最后一周必须工作 $60-48=12$ 小时才能得到门票。

所以正确答案是 D。

During the first $5$ weeks, Theresa works for a total of $8+11+7+12+10=48$ hours.

She promised to work $10\cdot 6=60$ hours in all.

This means that she has to work $60-48=12$ hours during the final week to earn the tickets.

Thus, D is the correct answer.

2007 AMC 8 第 1 题

答案：D

难度评级：560

解答：

其他年份的第 1 题