Question

15 years from now Ravi's age will be 4 times his present age what is Ravi's present age

Answer 1

let the Ravi's present age be x
then acc. to the ques.
x+15=4x
15=4x-x
15=3x
x=15/3
x=5
Ravi's present age is 5 years

Answer 2

let ravis present age be'x'
after 15 years= x+15=4x
                      =15=4x-x
                      =15=3x
                      =15 divide by 3=5
so,5 years is his present age