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Well, assuming you mean the value of the coins together is $20, and knowing that the value of a dime is $0.10 and that of a quarter is $0.25, then if we call the number of dimes 'd' and the number of quarters 'q', we can set up the following equations:

d + q = 100

0.10d + 0.25q = 20

Then you can obtain the number of dimes and quarters by solving this series of linear equations.

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Q: If you have a total of 100 dimes and quarters the value of your coins together is 20 how many of each coin do you have?
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