Bodhi has a collection of 175 dimes and nickels. The collection is worth $13.30. Which equation can be used to find n, the number of nickels in the collection?

If n is the number of nickels, then 175 − n is the number of dimes. Each dime is worth $0.10 and each nickel is worth $0.05, so the total value is 0.10(175 − n) + 0.05n. Setting that equal to $13.30 gives choice D.

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