Let us assume the age of the son now = x Then The age of the man now = 5x Now we have to calculate the age of the son and father 9 years ago Age of the son 4 years ago = x - 4 Age of the man 4 years ago = 5x - 4 Then 5x - 4 = 9(x - 4) 5x - 4 = 9x - 36 5x - 9x = -36 + 4 - 4x = - 32 MUltiplying both sides of the equation by -1 we get 4x = 32 x = 32/4 = 8 So the present age of the son is 8 years Present age of the man = 5x = 5 * 8 = 40 years So the present age of the man is 40 years and the present age of the son is 8 years.
