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Each piece was divided into 5 equal parts, so there were a total of 4 x 5 = 20 parts. These 20 parts were shared among the 5 people, so each person received 20/5 = 4 parts.
Since each piece was divided into 5 parts, each part represents 1/5 of a piece. Therefore, each person received 4 x 1/5 = 4/5 of a piece.
So, each person received 4/5 of the party size sub after all the parts were shared out.