Answer: She sold 18 loaves of banana bread.
To solve this problem, we are going to have to write 2 equations from the problems.
First, the number of loaves of banana bread was 4 more than twice the number of zucchini loaves. B = 2Z + 4
Second, altogether there was 25 loaves. B + Z = 25
To solve, we can substitute the first equation into the second equation.
(2Z + 4) + Z = 25
3Z + 4 = 25
3Z = 21
Z = 7
If there was 7 loaves of zucchini bread, then there must have been 18 loaves of banana bread to make 25 total loaves.