if robert changes his plan to give each person 2/5 of a pizza how many extra people can he feed

Answer 1

He was going to given then X of the pizza, so each one gets N/X where N is the # of slices.

Instead he is giving then 2/5 of the pizza so each one gets N over 2/5 = 5N/2

The difference is (5N)/2 - N/x = (5nx - 2n)/(2x)