SOLUTION: pat found a bag that had 29 coins consisting of dimes and quarters worth 4.70. how many quarters were in the bag?

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Question 965641: pat found a bag that had 29 coins consisting of dimes and quarters worth 4.70. how many quarters were in the bag?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
q = number of quarters
d = number of dimes

d + q = 29
10d + 25q = 470

25d + 25q = 725
-10d - 25q = -470
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15d = 255 ---> d = 17

---> 17 dimes, 12 quarters