math
posted by Jane .
Joseph sold tickets to the school musical. He had 12 bills worth $175 for the ticketssold. If all the money was $5 bills, $10 bills, and $20 bills, how many of each bill did he have?

math 
Steve
if he had x,y,z bills of $5,$10,$20 respectively,
x+y+z = 12
5x+10y+20z = 175
A third equation would help, so we have to do some trial and error.
1 $5
5 $10
6 $20
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