Question

A customer is owed $30.00. how many different combinations of bills, using only five, ten, and twenty dollar bills, are possible to give the customer his or her change

Answer 1

With 5's = 5x6

With 10's= 10x3

With 20's= 1 x (either 5x2 or/ 10x1)


Add them up you get= 6+3+2 

Up to 11, possible combinations.