2010 AMC 8 第 9 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。
9.
瑞安在一份有 道题的测试中答对了 ，在一份有 道题的测试中答对了 ，在一份有 道题的测试中答对了 。所有题目中瑞安答对了百分之多少？
Ryan got of the problems correct on a -problem test, on a -problem test, and on a -problem test. What percent of all the problems did Ryan answer correctly?
答案：D
小提示：
用答对总题数除以总题数
Divide the total correct answers by the total number of problems.
大提示：
将每份测试的百分比转换成答对题数
Convert each test percentage into a number of correct answers.
解答：
三份测试共有 题。
第一份测试答对 题。
第二份测试答对 题。
第三份测试答对 题。
因此他总共答对 题，答对比例为 。
所以正确答案是 D。
There were a total of problems.
On the first test, he solved problems.
On the second test, he solved problems.
On the third test, he solved problems.
Therefore, he solved a total of This means the fraction he solved is
Therefore, the answer is D .
其他年份的第 9 题
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