SOLUTION: You have a piggy bank containing a total of 99 coins in dimes and quarters. If the piggy bank contains $17.70, how many dimes are in the piggy bank?

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Question 963733: You have a piggy bank containing a total of 99 coins in dimes and quarters. If the piggy bank contains $17.70, how many dimes are in the piggy bank?
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 = 99
10d + 25q = 1770

25d + 25q = 2475
-10d - 25q = -1770
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15d = 705
d = 47

There are 47 dimes in the piggy bank.