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. What fraction of the party size sub did each person get after all the parts were shared out

Each person would get 1/5 of each piece, so in total each person would get 4/5 of the party size sub.