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24 January, 09:23

A box of 80 coins, consisting of only nickels and dimes, is worth 7 dollars and 80 cents. Find the number of nickels.

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  1. 24 January, 09:50
    0
    4 nickles

    Explanation:

    80=N+D

    7.80=0.05N + 0.1D

    D=80-N

    7.80=0.05N + 0.1 (80-N)

    7.80=0.05N + 8 - 0.1N

    0.1N + 7.80 = 8 + 0.05N

    0.05N = 8-7.80

    0.05N = 0.2

    N = 4
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