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CUET
General Test
Numerical Ability
Average
The average of n observation is 55 . If one observation of value 80 is added, then the average of all observations is 60 . What is the value of n ?
5
7
3
4
55 × n + 80 = 60 (n + 1)
55n + 80 = 60n + 60
5n = 20
n = 4