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21 January, 16:50

Ile kilogramów solanki 6-procentowej i ile kilogramów 9-procentowej należy zmieszać, aby otrzymać 9 kilogramów solanki 8-procentowej?

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  1. 21 January, 16:57
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    Answer: solanka 6-procentowa=3 kg

    solanka 9-procentowa = 6 kg

    Step-by-step explanation:

    Let solanka 6-procentowa=x kg

    Let solanka 9-procentowa = y kg

    So x+y=9

    => x=9-y (1)

    6%=0.06 9%=0.09 8%=0.08

    So pure salt is 0.06*x + 0.09*y = 9*0.08 (2)

    Lets put 9-y instead x in (2)

    0.06 * (9-y) + 0.09*y=0.72

    0.54-0.06*y + 0.09*y=0.72

    0.03*y=0.18

    y=6kg = > x=9-y = > x=9-6=3 kg
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