Answer:
Ravi’s present age will be 5. 
 Explanation:
From the given, Let Ravi’s present age is taken as "a" years. 
After 15 years, his age = (a+15) years. 
By the given, it is identified that the age of Ravi after 15 years is equal to the 4 times of his present age.
Given, 

Then, it has been found that the present age of Ravi is 5 when his age after 15 years will be 4 times of his present age.