Question

The average age of 4 sisters is 7 years. If the age of mother is included ,the average is increased by 6 years. The age of the mother is

Answer 1

let a = total average age of the sisters

& b = age of the mother

as given in the question the average age all sisters is 7

So , a/4=7

then the age of mother is added and the average gets increased by 6 years-(6+7)

then ,a+b/5=13

put the value of a in this equation

b=65–28=37

Thus the age of mother is 37