Question

Fifteen years from now Ravi's age will be four times his present age. What is his present age.

Answer 1

Let the present age of Ravi be x 
after fifteen years his age will be 4 times of his present age
 ⇒ 4x = x+15
⇒4x-x = 15
⇒3x=15
⇒x=15/3=5
Therefore , present age of Ravi (x) = 5 ..

Answer 2

Ravi's age after 15 years = x+15

Ravi's age = 4 times his present age = 4x

According to question -

15 + x = 4x

=> 15 = 4x-x = 3x

=> 15 = 3x

=> x = 15/3

=> x = 5

Thus , Ravi's present age is 5 years. .........

Thank u. .....