Answer the following question, with explanation first.
Harold had 100 marbles. He kept 20 marbles and shared the rest evenly among his 5 friends. How many marbles did each friend get?

16
Harold shared 100 - 20 = 80 marbles with his friends.

Therefore, his 5 friends got 80 / 5 = 16 marbles each.

.

The final answer: 16