fifteen years from now ravi's age will be four times his present age . what is his present age?

Let Ravi's present age be X

After 15 years his age will be X + 15

At the same time it will be 4 times his present age i.e 4X

4X = X+15

4X - X = 15

3X = 15

X = 5

Verification

Ravi's present age = 5

After 15 years his age will be = 5 + 15 = 20

20 is 4 times of 5