SOLUTION: a collection of 36 dimes and quarters is worth $4.80.how many dimes are there

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Question 668759: a collection of 36 dimes and quarters is worth $4.80.how many dimes are there
Answer by swincher4391(1107) About Me  (Show Source):
You can put this solution on YOUR website!
d+q = 36
10d + 25q = 480
10d + 10q = 360 (multiplying first by 10)
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15q = 120
q = 8
d+8 = 36
d = 28
28 dimes; 8 quarters