The averageage of threebrotheris 15years if the age of two brothers is 15years and 12years find the age of of third brothers
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Average =sum of the no. \total no of terms
Let the age of third brother is x
The age of first brother is 15 years
The age of second brother is 12 years
A.T.Q
Average=sum of the age of three
brother /no of brother
15 = 15+12+x / 3
15=27+x / 3
15*3=27+x
45=27+x
45-27=x
18=x
So the age of third brother is 18 years
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