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Charlie has dimes and quarters that have a value of $26.50. He has 15 fewer dimes than quarters. Which system of equations can be used to determine the number of dimes, d, and quarters, q?

A. q=d-15, d+q=26.50
B. d=q-15, 0.1d+0.25q=26.50
C. q=d-15, 0,1d+0.25q=26.50
D. d=q-15, d+q=26.50