Question

15 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 fifteeen years his age will be four times the present age 
⇒ 4x = x +15
⇒ 4x - x = 15
⇒ 3x = 15
⇒ x = 15/3
⇒ x = 5 
Therefore , present age of Ravi = 5 .

Answer 2

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Refer the attachment.