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25 November, 00:33

A scientist mixes water (containing no salt) with a solution that contains 35% salt. She wants to obtain 105 ounces of a mixture that is 30% salt. How many ounces of water and how many ounces of the 35% salt solution should she use?

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  1. 25 November, 00:42
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    90

    Step-by-step explanation:

    Start with changing 35% and 30% to a decimal.

    35% =.35%

    30% =.30%

    Then multiply 105 by. 30%. (but don't put the percent sign in the calculator when multiplying)

    105 x. 30% = 31.5

    Then you want to divide 31.5 by. 35%

    31.5 /.35% = 90
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