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

Lets the rahul's  age be x ..
father is three times .... 3x 
fou years ago ...he was 4 time as rahul =4x 
current age ... =  4x+4=3x
                        = 4x-3x=4
                       = x= 4

Answer 2

let rahul's age be x ;
his father is three times of his age so let it be 3x 
four years ago his father's age was 4 times as rahul's age 4x
 his present age =  4x+4=3x
                        = 4x-3x=4
                       = x= 4
therfore rahul's present age 4