1985 AMC 8 第 17 题
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17.
如果你前六次数学测验的平均分是 ，前七次数学测验的平均分是 ，那么你第七次测验的分数是
If your average score on your first six mathematics tests was and your average score on your first seven mathematics tests was then your score on the seventh test was
答案：D
小提示：
七次测验的总分是 ，六次测验的总分是
The total for seven tests is and the total for six tests is
大提示：
第七次测验的分数是这两个总分的差
The seventh score is the difference between those two totals
解答：
七次测验的平均分是 ，总分为 ；六次测验的平均分是 ，总分为 。
第七次测验的分数是 。
所以正确答案是 D。
Seven tests averaging total points; six tests averaging total points.
The seventh score is
Thus, the correct answer is D .
其他年份的第 17 题
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