Question 113876
Hello!

I will show you how I solve these kinds of problems.



Representation:
Let x-3 be the age of darren 3 years ago, x+15 be his age 15 years from now.

Equation:
x+15=4(x-3)

Solution:
x+15=4(x-3)
x=4x-12-15
x=4x-27
-3x=-27
3x=27
x=9


Final Answer:
He is now 9 years old...