SOLUTION: Spongebob has 21 coins, all dimes and quarters worth $3.15. How many dimes and how many quarters does he have?

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Question 1168658: Spongebob has 21 coins, all dimes and quarters worth $3.15. How many dimes and how many quarters does he have?

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
q quarters
21-q dimes

25q%2B10%2821-q%29=315, to account for cents.
Solve and then finish.