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19 September, 06:37

If the lab technician needs 30 liters of a 25% acid solution, how many liters of the 10% and the 30% acid solutions should she mix to get what she needs?

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  1. 19 September, 09:51
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    7.5 liters of 10% solution and 22.5 liters of 30% solution

    Step-by-step explanation:

    Let there be x liters of 10% acid solution and y liters of 30% acid solution. Lab technician needs 30 liters of the final solution, so this means sum of x and y has to be 30 as these two will mix up to give the final acid solution. So, we can write the equation as:

    x + y = 30

    or

    y = 30 - x

    x liters of 10% solution and y liters of 30% solution will add up to give 30 liters of 25% acid solution. We can set up another equation as:

    x liters of 10% acid + y liters of 30% acid = 30 liters of 25% acid

    Changing percentage to decimals:

    0.1 (x) + 0.3 (y) = 0.25 (30)

    Using the value of y from our upper equation in the previous equation, we get:

    0.1x + 0.3 (30-x) = 7.5

    0.1x + 9 - 0.3x = 7.5

    - 0.2x = - 1.5

    x = 7.5 liters

    y = 30 - x = 30 - 7.5 = 22.5 liters

    This means, 7.5 liters of 10% acid solution and 22.5 liters of 30% acid solution would be needed to prepare 30 liters of 25% acid solution.
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