SOLUTION: Katie has $880 in five- and twenty-dollar bills. If she has four more twenties than fives, how many 20-dollar bills does she have? My main probllem with this question is knowi

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Question 211265: Katie has $880 in five- and twenty-dollar bills. If she has four more twenties than fives, how many 20-dollar bills does she have?
My main probllem with this question is knowing how to start. I think if I knew how to start I would be fine.
Thank you for your time and I appriciate your help.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Katie has $880 in five- and twenty-dollar bills. If she has four more twenties than fives, how many 20-dollar bills does she have?
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Let # of fives be "f"; Let # of twenties be "t".
Equations:
Value Eq: 5f + 20t = 880
Quantity Eq: t = f+4
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Substitute and solve for f and then for t.
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Cheers,
Stan H.