Mark M. answered • 01/22/20

Mathematics Teacher - NCLB Highly Qualified

At the end they had 15 cookies

Before that they had 45 cookies (2/3 went to friends)

Before that they had 48 cookies (3 went to kids)

Before that they had 80 cookies (2/5 went to nursing home)

Before that they had 81 cookies (threw one away)

Before that they had 108 cookies (1/4 went to teachers)

QED