Question

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. Iam twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put togeather.
How old is the man's son?​

Answer 1

Answer:

Let daughter's age = x

Son's age = 5x

Wife's age = 5(5x) = 25x

Man's age = 2(25x) = 50x

Grandmother's age = 81 years

ATQ, x+5x+25x+50x = 81 years

81x = 81

x = 81/81

x = 1

Son's age = 5x = 5×1 = 5 years