Question

Rahuls father age is 3 Times as old as rahul. Four years ago his father was 4 Times as old as rahul. How old is rahul?

Answer 1

Hello !
Let the present age of Rahul be x years .
Then His father's present age = 3 × x
Four years ago:-
Rahul's age = x - 4   years 
The father's age = 4 ×(x-4) years or 3 x - 4
Then ,
⇒ 4(x-4) - 3x -4 
⇒ 4x - 16 = 3x -4
⇒ 4x - 3x = 16 -4
⇒ x = 12 years .                                   Ans.
The present age of Rahul  is 12 years.                     Ans.
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Answer 2

If the father is age f and the son age s, 

f = 3s 
(f-4) = 4(s-4) 
3s-4 = 4s-16 
s = 12 

so, son is 12, father is 36. 
4 years ago, son was 8, father was 32.