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Professor Baird wants to mix a solution containing 10% acid with one containing 15% acid to obtain a 20 ounce solution containing 12% acid. How many ounces of the 10% solution should the professor use?

Translate the word problem into an equation.

  • Math -

    add up the amount of acid in each part:

    .10x + .15(20-x) = .12(20)
    x = 12

    so, 12 oz 10% and 8 oz 15%

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