Ahmed's age after 15 years will be 5 times his age 5 years back. What is the present age of Ahmed?

Explanation

Then, Ahmed's age after 15 years $= (x + 15)$ years.
Ahmed age of 5 years back $= (x - 5)$ years.
Given, $(x + 15) = 5 (x - 5)$
$x + 15 = 5 x - 25$
$5 x - x = 15 + 25$
$4 x = 40$

x = 10