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You have a piggy bank containing a total of 85 coins in dimes and quarters. If the piggy bank contain $14.50, how many dimes are there in the piggy bank?

Interest=principal multiply Rate multiply 1, or interest=principal multiply rate.

  • Algebra -

    d = number of dimes
    .10d = value of dimes
    85 - d = number of quarters
    .25(85 - d) = value of quarters

    0.10d + .25(85 - d) = 14.50
    Solve for d, number of dimes
    85 - d = number of quarters

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