SOLUTION: Christina makes a $9.25 purchase at a bookstore with a $20 bill. The store has no bills and gives her change in quarters and fifty cent pieces. There are 30 coins in all. How many
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Question 183322: Christina makes a $9.25 purchase at a bookstore with a $20 bill. The store has no bills and gives her change in quarters and fifty cent pieces. There are 30 coins in all. How many of each kind are there? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Christina makes a $9.25 purchase at a bookstore with a $20 bill. The store has no bills and gives her change in quarters and fifty cent pieces. There are 30 coins in all. How many of each kind are there?
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Amount of change = 20.00-9.25 = 10.75
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Equations:
Quantity Equation: q + f = 30
Value Equation..:25q +50f = 1075 cents
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Multiply thru the 1st be 25:
25q + 25f = 25*30
25q + 50f = 1075
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Subtract 1st from 2nd to solve for "f"
25f = 1075-25*30
f = 13 (# of fifty cent pieces)
Since q + f = 30, q = 27 (# of quarters)
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Cheers,
Stan H.
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