Question

A person says that his son is 5 times as old as his daughter and his wife is 5 times older than his son and he is twice the age of his wife . The sum total of all the ages equals the age of the grand mother who celebrated her 81st birthday today. How old was his son?
A) 50 yrs
B) 25 yrs
C) 72 yrs
D) 40 yrs

Answer 1

Let the present ages of son and father be x and (60 -x) years respectively.

Then, (60 - x) - 5= 4(x - 5)

55 - x = 4x - 20

5x = 75  => x = 15

Answer 2

Heya mate
The answer of ur question is

Let age of son be x and the age of his father be ( 60 - x )

Now ( 60 - x ) - 5 = 4( x - 5)
55- x = 4x - 20
5x = 75
x = 25

So , the age of son be 25 yrs

hope it helps