Answer:
1/15
Explanation:
Total pie = x
Total pie left = 1/5x
Then, three friends came over and shared the leftover pie
How much of the pie did each friend eat?
Pie eaten by each of the three friends = leftover pie / 3 friends
= 1/5x ÷ 3
= 1/5x * 1/3
= 1/15x
Each of the three friends ate 1/15 of the pie