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29 November, 10:00

You need a 45% alcohol solution. on hand, you have a 480 ml of a 40% alcohol mixture. you also have 85% alcohol mixture. how much of the 85% mixture will you need to add to obtain the desired solution?

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  1. 30 November, 00:37
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    x ml of 85% mixture will needed to add

    0.40*480 ml alcohol in 480 ml solution (40%)

    0.85x alcohol in x ml solution (85%)

    0.45 (480 + x) in (480 + x) ml 0.45% solution

    0.40*480+0.85x = 0.45 (480 + x)

    192+0.85x=216+0.45x

    0.85x-0.45x=216-192

    0.4x=24

    x=24/0.4=60 ml a 45% alcohol solution
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