SOLUTION: A cash register contains only dimes and quarters. There are 65 coins worth $12.80 in the register. How many dimes and quarters are in the register? I have tried to set up but

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Question 502266: A cash register contains only dimes and quarters. There are 65 coins worth $12.80 in the register. How many dimes and quarters are in the register?
I have tried to set up but can't figure it out.
i.e. I tried: 65 - .10d = quarters
65 - .10d + ??? = 12.80

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A cash register contains only dimes and quarters. There are 65 coins worth $12.80 in the register. How many dimes and quarters are in the register?
I have tried to set up but can't figure it out.
i.e. I tried: 65 - .10d = quarters
65 - .10d + ??? = 12.80
--------------------
65 - d = q
10d + 25q = 1280
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