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20 July, 23:02

How many pounds of nails costing $7 per pound must be mixed with 6 pounds of nails costing $3 per pound to yield a mixture costing $4 per pound?

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  1. 20 July, 23:14
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    Let nails 7/pound=N1

    nails 3/pound=N2

    let N1=x

    N2=6

    then total=x+6

    7x+6*3 = (x+6) * 4

    7x+18=4x+24

    3x=6

    x=2

    so 2 pounds on Nails costing 7/pound must be added
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