1973 AMC 12 第 12 题
先试着解答 1973 AMC 12 第 12 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 1973 AMC 12 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
12.
一个由医生和律师组成的群体平均年龄（算术平均值）为 。若医生的平均年龄为 ，律师的平均年龄为 ，则医生人数与律师人数之比为
The average (arithmetic mean) age of a group consisting of doctors and lawyers is If the doctors average and the lawyers years old, then the ratio of the number of doctors to the number of lawyers is
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