Start with A being the number of Aeropostale stores
The the number of Gap stores is 3.25 * A (remember that 3 1/4 is the same as 3.25)
Now you know the total is A + 3.25 * A = 4046
Solve for A
4.25 * A = 4046
A = 952 <-- number of Aeropostale stores
4046 - 952 = 3094 <-- number of Gap stores
All the best
Lori