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24 June, 03:07

How many liters of a 65% alcohol solution must be added to 30 L of a 25% alcohol solution to produce a 40% alcohol solution

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  1. 24 June, 07:04
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    18

    Step-by-step explanation:

    Let's say x is the volume of the 65% solution.

    Amount of alcohol in the 65% solution + amount of alcohol in the 25% solution = amount of alcohol in the 40% solution

    0.65 x + 0.25 (30) = 0.40 (x + 30)

    0.65 x + 7.5 = 0.40 x + 12

    0.25 x = 4.5

    x = 18

    You need to add 18 liters of the 65% solution.
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