SOLUTION: I paid my bill using dimes only. If I had paid using only quarters, I would have needed 18 fewer coins. How much was my bill?

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Question 857906: I paid my bill using dimes only. If I had paid using only quarters, I would have needed 18 fewer coins. How much was my bill?
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
d= number of dimes used.
0.1d= amount paid, in $.
d-18= number of quarters needed to pay using only quarters.
0.25%28d-18%29= amount those quarters add up to, in $.
0.25%28d-18%29=0.1d
0.25d-4.5=0.1d
0.25d-0.1d-4.5=0
0.15d-4.5=0
0.15d=4.5
d=4.5%2F0.15
d=30
0.1d=0.1%2A30=highlight%283%29 is the amount paid, in $.