SOLUTION: You have 20 coins (dimes and quarters) total. They total $3.05. How many dimes and quarters do you have?

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Question 987811: You have 20 coins (dimes and quarters) total. They total $3.05. How many dimes and quarters do you have?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
d = number of dimes
q = number of quarters

d + q = 20
10d + 25q = 305

Multiply the first equation by 25.

25d + 25q = 500
-(10d + 25q = 305)
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15d = 195
d = 13

You have 13 dimes and 7 quarters.