At the end of this process, Dario and his 4 friends will each have 5 portions of the original 4 pieces of cake, which means they will have 20 portions of cake in total.
Each portion will be 1/5 of a piece of cake, so Dario and his friends will have:
20 portions x 1/5 piece per portion = 4 pieces of cake
So even though Dario divided the cake into smaller portions, they still have the same amount of cake in total.
Dario decides to take each one of the 4 pieces and share it equally among the 5 of them. First, he divides one piece into 5 equal parts and shares it, then the next one, and so on.
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