SOLUTION: On a table there are 20 coins, some quarters and some dimes. There value is $3.05. How many if each coin are there?

Question 781691: On a table there are 20 coins, some quarters and some dimes. There value is $3.05. How many if each coin are there?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
On a table there are 20 coins, some quarters and some dimes. There value is $3.05. How many if each coin are there?
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Quantity Equation: d + q = 20 coins
Value Equation:: 10d+25q = 305 cents
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Modify for elimination::
2d + 2q = 40
2d + 5q = 61
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Subtract and solve for "q":
3q = 21
q = 7 (# of quarters)
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d = 20-7 = 13 (# of dimes)
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Cheers,
Stan H.
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