SOLUTION: Bobby had 42 dimes and quarters. The total value of the coins is $9.60. What is the value of Bobby's dimes?

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Question 965516: Bobby had 42 dimes and quarters. The total value of the coins is $9.60. What is the value of Bobby's dimes?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
d = number of dimes
q = number of quarters

10d + 25q = 960
d + q = 42

10d + 25q = 960
-10d - 10q = -420
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15q = 540
q = 36 ---> d = 6

value of dimes = 10d = 60 cents