Answer:
3
Step-by-step explanation:
12 + 15 = 27
27 % 8 = 3.375
lets just say that she gives every person three apples. there would be three left. if she gave everyone 3.375 apples, there would be none left. Therefore, if you take the simpler way, you would get three apples leftover. if you went the complex way, there would be no more apples left.
I hope this helps!