SOLUTION: Sam has $3.30 in quarters and dimes, and the total number of coins is 18. How many quarters and how many dimes?

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Question 1103568: Sam has $3.30 in quarters and dimes, and the total number of coins is 18. How many quarters and how many dimes?
Answer by josgarithmetic(39799) About Me  (Show Source):
You can put this solution on YOUR website!
q and d
system%28q%2Bd=18%2C25q%2B10d=330%29

5q%2B2d=66


Multiply the coin count equation by 2.
This is that system:
system%285q%2B2d=66%2C2q%2B2d=36%29

Continue one-step into Elimination Method.
3q=30
highlight%28q=10%29------------ten quarters
therefore highlight%28d=8%29---------eight dimes