SOLUTION: If Antonio has 15 dimes and quarters in his pocket, and they have a combined value of 270 cents, how many of each coin does he have?

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Question 1126003: If Antonio has 15 dimes and quarters in his pocket, and they have a combined value of 270 cents, how many of each coin does he have?
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
d+q = 15; d = 15-q
10d+25q = 270 substitute for d:
10(15-q)+25q = 270
150-10q+25q = 270
15q = 120
q = 8 Antonio has 8 quarters
8 x 25 = 200
270 - 200 = 70
70/10 = 7 Antonio has 7 dimes