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15 December, 03:22

Allison has $1.60 in nickels and dimes. She has 11 more nickels than dimes. How many dimes and nickels does she have?

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  1. 15 December, 03:35
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    0.05n + 0.10d = 1.60

    n = d + 11

    0.05 (d + 11) + 0.10d = 1.60

    0.05d + 0.55 + 0.10d = 1.60

    0.15d = 1.60 - 0.55

    0.15d = 1.05

    d = 1.05 / 0.15

    d = 7 < = = = 7 dimes

    n = d + 11

    n = 7 + 11

    n = 18 < = = = 18 nickels
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