SOLUTION: Eleven dimes and quarters have a total value of $2.15. How many of each were there?

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Question 249376: Eleven dimes and quarters have a total value of $2.15. How many of each were there?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
let d= dimes and q=quarters
10d+25q=215
d+q=11
d=11-q
substitute 11-q for d in 10d+25q=215