You can put this solution on YOUR website! father is 3 times of son. difference between their ages is 30. after 4 years sum of their ages will 63.
------------------
father is 3 times of son
I'll assume you mean 3 times as old.
----
3x --> the difference is 2x
--> 15 and 45
-----------------
after 4 years sum of their ages will 63.
That's not possible.