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) (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.
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