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19 February, 14:56

Sarah has a collection of nickels, dimes, and quarters worth $15.10. she has 10 more dimes than nickels and twice as many quarters as dimes. how many coins of each kind does she have?

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  1. 19 February, 18:20
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    let x represent the number of nickels.

    As she has 10 more dimes than nickels, the number of dimes is x + 10.

    As she has twice as many quarters as dimes, the number of quarters is 2 (x + 10)

    the total value is $15.10, so I get an equation:

    0.05x + 0.1 * (x + 10) + 0.25*2 (x + 10) = 15.10

    0.05x + 0.1x + 1 + 0.5x + 5 = 15.10

    0.65x = 9.1

    x = 14

    x + 10 = 24

    2 (x + 10) = 48

    there are 14 nickes, 24 dimes and 48 quarters
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