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16 May, 21:44

How much salt should Ilya add to 810g of water to make 10% solution? How much solution will he make?

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  1. 16 May, 21:54
    0
    10/100 = x / (810+x)

    1/10 = x / (810 + x)

    10x = 810 + x

    9x = 810

    x = 90 g salt

    mass of solution = mass of water + mass of salt

    ms = mw + m salt

    ms = 810 + 90

    ms = 900 g of solution
  2. 16 May, 22:04
    0
    Let x be the number of grams of salt to be added.

    Then x / (810+x) = 1/10; 10x=810+x; 9x=810, x=90g. He should add 90g of salt.
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