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13 October, 08:45

Debi had $1.55 in a collection of dimes and nickels. The number of nickels is seven more than the number of dimes. Find the number of each type of coin.

There are ___ dimes.

There are ___ nickels.

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  1. 13 October, 11:45
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    N = D+7

    0.10D + 0.05 (D+7) = 1.55

    0.15D + 0.35 = 1.55

    0.15D=1.20

    D=120/0.15 = 8

    8x0.10 = 0.80

    1.55-0.80 = 0.75

    8+7=15 * 0.05 = 0.75

    8 dimes and 15 nickels
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