Question

15 year from now Ravi's age will be 4 time his presented what is Ravi present age

Answer 1

let age of ravi= x

according to question

x+15=4x
4x-x=15
3x=15

x=5

so age of ravi is 5 years

Answer 2

Let the present age of Ravi be x years.
After 15 years Ravi's age will be = x + 15 years
But given that after 15 years Ravi's age will be 4 times than his present age.

Therefore
x + 15 = 4x
3x = 15
x = 5 years

The present age of Ravi = 5 years