2011 AMC 8 第 11 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。
11.
图中显示一周内 Asha（左柱）和 Sasha（右柱）每天学习的分钟数。平均每天 Sasha 比 Asha 多学习多少分钟？
The graph shows the number of minutes studied by both Asha (left bar) and Sasha (right bar) in one week. On the average, how many more minutes per day did Sasha study than Asha?
小提示：
可以平均五天每天的差值，而不是分别求两人的平均数
Average the five daily differences instead of averaging each person separately.
大提示：
逐日比较 Sasha 和 Asha
Compare Sasha and Asha day by day.
解答：
可以通过每天的差值来计算平均分钟数之差。
从星期一开始，Sasha 与 Asha 的差值分别为 、、、、。总差为 分钟，因此平均差为 。
所以正确答案是 A。
We can calculate the difference in average minutes by looking at the differences per day.
Starting with Monday, the differences between Sasha and Asha are and This is a total of minutes. Therefore, the average difference is
Thus, A is the correct answer.
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