Given :-
- We have given in the question that, A father is 3 times as old as his son
- 9 years a ago, The father was 4 times as old as his son
To Find :-
- We have to find the present ages of son and father
Let's Begin :-
Let the present age of son be x
- A father is 3 times old as his son
Therefore,
Present age of the father will be
9 years ago,
The age of the son was
So,
Age of the father was
But,
- It is given that, 9 years a ago father was 4 times as old his son age
- That is,
From eq(1) and eq(2) :-
Thus, The present age of the son is 9 years
Therefore,
Age of the father will be
Hence, The present ages of son and father is 9 years and 27 years