Answer:
The sum of 1/5 and 1/5 does make sense if you add you will get 1.
Explanation:
The size of the cupcake and the size of the cake differ, so when your saying 1/5 of the cupcake, 1/5 of a cupcake is not the same as 1/5 of the cake . Idk if this will help, but I gave you a suggestion!
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