题目信息
In a certain population, there are 3 times as many people aged 21 or under as there are people over 21. The ratio of those 21 or under to the total population is
A:1 to 2
B:1 to 3
C:1 to 4
D:2 to 3
E:3 to 4
参考答案及共享解析

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正确答案:
E:3 to 4
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