SOLUTION: Mary has a piggy bank in which she has saved only dimes and quarters. She has 17 coins in the bank worth $2.45. How many coins of each type does she have?

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Question 993331: Mary has a piggy bank in which she has saved only dimes and quarters. She has 17 coins in the bank worth $2.45. How many coins of each type does she 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 = 17
10d + 25q = 245

Multiply the first equation by 25.

25d + 25q = 425
-(10d + 25q = 245)
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15d = 180
d = 12

Mary has 12 dimes and 5 quarters.