Chapter 14, Word problem with bills (like problems #23-28).
A person has 25 bills, which are all either $1 bills or $5 bills, which add up to $89. How many of each kind of bill does the person have?
This problem is like problems #23 through #28 in your homework. Those homework problems deal with coins, not bills, but the concept is the same. You can avoid working with decimals by counting cents rather than dollars.