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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 -

    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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