A certain list consists of 21 different numbers.

A certain list consists of 21 different numbers. If n is in the list and n is 3 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?

Quiz

Answer/Solution

3/23

Steps/Work

series : a1, a2....a20,n
sum of a1+a2+...+a20 = 20*x (x = average)
so, n = 3*x
Hence, a1+a2+..+a20+n = 23x
So, the fraction asked = 3x/23x =3/23
Answer E

General Calculator / Auto Solver

A certain list consists of different numbers. If n is in the list and n is times the average ( arithmetic mean ) of the other numbers in the list, then n is what fraction of the sum of the numbers in the list?

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