1994 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.
去年夏天有 名学生参加篮球营。其中有 名男生和 名女生。另外， 名学生来自 Jones Middle School， 名来自 Clay Middle School。有二十名女生来自 Jones Middle School。来自 Clay Middle School 的男生有多少名？
Last summer students attended basketball camp. Of those attending, were boys and were girls. Also, students were from Jones Middle School and were from Clay Middle School. Twenty of the girls were from Jones Middle School. How many of the boys were from Clay Middle School?
答案：B
小提示：
先求有多少名女生来自 Clay Middle School
First find how many girls came from Clay Middle School
大提示：
用 Clay 的总人数 减去 Clay 女生人数，得到 Clay 男生人数
Subtract the Clay girls from the Clay students to get the Clay boys
解答：
共有 名女生，其中 名来自 Jones，所以来自 Clay 的女生有 名。
Clay 总共有 名学生，所以来自 Clay 的男生人数是 。
所以正确答案是 B。
Since girls attended and were from Jones, girls were from Clay.
Clay had students total, so the number of Clay boys is
Thus, the correct answer is B .
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