题目信息
A certain list consists of 21 different numbers. If n is in the list and n is 4 times the average (arithmetic mean) of the other 20 numbers in the list, then n is what fraction of the sum of the 21 numbers in the list?
A:1/20
B:1/6
C:1/5
D:4/21
E:5/21
参考答案及共享解析

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已选答案:
正确答案:
B:1/6
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