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math

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I'm not sure of how to solve word problems. The question is,"One lawn fertilizer is 24% nitrogen and another is 12% nitrogen. How much of fertilizer should be mixed to obtain 100 kg of fertilizer that is 21% nitrogen?"

  • math - ,

    Nitrogen total=sum of parts
    100*.21=.24*x + .12y
    but x+y=100
    21=.24x+.12(100-x)
    solve for x first.

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