Let's use algebra to solve this problem.
Let A be the current age of Agyapong, and let M be the current age of Musah.
From the problem, we know that:
A = 3M (Agyapong is three times as old as Musah)
A - 3 = 4(M - 3) (Three years ago, Agyapong was four times as old as Musah)
We can simplify the second equation by distributing the 4:
A - 3 = 4M - 12
Now we can substitute the first equation into the second equation:
3M - 3 = 4M - 12
Simplifying this equation, we get:
M = 9
So Musah is currently 9 years old.
Using the first equation, we can find Agyapong's age:
A = 3M = 3(9) = 27
So Agyapong is currently 27 years old.