Answer Posted / dinesh kumar

let x be the avg age of each person in the family ten years
back...
so total age=6x
after 10 years i.e,now the total age of the family =6x+60
let grand father age as y
then the average of the family=(6x+60-y)/5
(bcoz grand father has expired and the new born baby has no
age at present)

according to the given question (6x+60-y)/5=x

bcoz x is the avg age bfore 10 years.

while calc the equation according to the presnt age we have
to add 10 to the result....


so the answer is 70

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