Question 808921: Paula has 30 coins in dimes and quarters. Their total value is $4.50. How many coins of each type does she have?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! d + q = 30
q = 30 - d
10d + 25q = 450
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10d + 25(30 - d) = 450
10d + 750 - 25d = 450
15d = 300
Answer:
d = 20
q = 10
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