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24 August, 13:49

There is a beaker of 3.5% acid solution and a beaker of 6% acid solution in the science lab. Mr. Larson needs 200ml of 4.5% acid solution for an experiment. How many of each solution should he combine?

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  1. 24 August, 14:01
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    Below are the choices:

    A. 80 mL of the 3.5% solution and 120 mL of the 6% solution

    B. 120 mL of the 3.5% solution and 80 mL of the 6% solution

    C. 140 mL of the 3.5% solution and 60 mL of the 6% solution

    D. 120 mL of the 3.5% solution and 80 mL of the 6% solution

    Let fraction of 3.5% in final solution be p.

    p * 3.5 + (1 - p) * 6 = 4.5

    3.5p + 6 - 6p = 4.5

    2.5p = 1.5

    p = 3/5

    3/5 * 200 = 120

    Therefore the answer is B. 120 ml of 3.5% and 80 ml of 6%.
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