题库搜索>问题求解PS-12986
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?
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20个数的平均数是x,n=4x,21个数的和是（20x+4x)
n/21个数的和是4/24=1/6
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看错题的选1/6的有举手的吗
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2020-04-11 22:01:03
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