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? Let's think first. Chain of thought:
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The total number of cakes baked is 12 + 4 = 16 cakes. But since Diego ate 1 cake, there are 16 - 1 = 15 cakes left.
Therefore, the answer is 15.
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