SOLUTION: how many ways can you make change for a $50 bill using $5, $10, and $20 bills?

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Question 130307: how many ways can you make change for a $50 bill using $5, $10, and $20 bills?
Answer by ilana(307) About Me  (Show Source):
You can put this solution on YOUR website!
20, 20, 10
20, 20, 5, 5
20, 10, 10, 10
20, 10, 10, 5, 5
20, 10, 5, 5, 5, 5
20, 5, 5, 5, 5, 5, 5,
10, 10, 10, 10, 10
10, 10, 10, 10, 5, 5
10, 10, 10, 5, 5, 5, 5
10, 10, 5, 5, 5, 5, 5, 5
10, 5, 5, 5, 5, 5, 5, 5, 5
5, 5, 5, 5, 5, 5, 5, 5, 5, 5
(So I believe 12 ways.)