Question 212020
Let Henry's age be x.
Then Jamal's age is 2x - 3.

As their sum is 39, we have
x + 2x - 3 = 39

Solving for x, we have
3x = 42
x = 14
So Henry is 14 years old. 
Jamal is 2x - 3 = 25 years old.