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Math Help - homework due tomorrow.

  1. #1
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    Exclamation homework due tomorrow.

    Solution A is 30% alcohol and solution B is 60% alcohol. How much of each is needed to make 80 liters of a solution that is 45% alcohol?

    please help.
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    Quote Originally Posted by heather_meaghan View Post
    Solution A is 30% alcohol and solution B is 60% alcohol. How much of each is needed to make 80 liters of a solution that is 45% alcohol?

    please help.
    Call the amount of each solution needed x and y (measured in liters). We know that if we combine these two amounts, we should get a total of 80 liters, so

    x + y = 80.

    We also know that we want our final solution to be 45% alcohol, so

    0.30x + 0.60y = 0.45\cdot80.

    Solve for x and y.
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  3. #3
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    thank you very much.
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