SOLUTION: 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?

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1.  6 fives.
2.  1 ten and 4 fives.
3.  2 tens and 2 fives.
4.  3 tens.
5.  1 twenty and 2 fives.
6.  1 twenty and 1 ten.

Edwin