Diego baked 12 cakes for his sister's birthday. Donald also baked 4 cakes, but ate 1 while waiting for the party to start. How many cakes are left?
Thoughts? Step-by-step reasoning:
The total number of cakes baked is 12 + 4 = 16 cakes. But since Diego ate 1 cake, there are 16 - 1 = 15 cakes left.
Thus, the answer is 15.