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4 June, 04:16

A piggy bank contain $5.60 in nickel and dime. The number of nickel is 8 less than 3 time the dime. How many nickel and dime are their in the piggyback?

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  1. 4 June, 04:42
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    0.05n + 0.10d = 5.60

    n = 3d - 8

    0.05 (3d - 8) + 0.10d = 5.60

    0.15d - 0.40 + 0.10d = 5.60

    0.15d + 0.10d = 5.60 + 0.40

    0.25d = 6

    d = 6 / 0.25

    d = 24 < = = = there are 24 dimes

    n = 3d - 8

    n = 3 (24) - 8

    n = 72 - 8

    n = 64 < = = there are 64 nickels
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