Question

Alycia's pggy bank has dimes and quarters in it. The numbers of dimes is four less than three times the number of quarters. If the total value of the coins is $7.85, how many dimes are in the piggy bank?
q = number of quarters
3q - 4 = number of dimes
0.25q = value of quarters
0.10(3q - 4) = value of dimes

0.25q + 0.10(3q - 4) = 7.85

Solve for q, number of quarters
3q - 4 = number of dimes

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