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12 September, 05:03

Joshua is doing a chemistry experiment that calls for a 30% solution of copper sulfate. He has 40ml of 25% solution. How many millimeters of 60% solution should joshua add to obtain the required 30% solution?

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  1. 12 September, 05:25
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    6 2/3 mL

    Step-by-step explanation:

    Multiply thru by 100 to get:

    1000 + 60x = 30*40 + 30x

    30x = 200

    x = 6 2/3 mL (amt. of 60% solution needed in the mixture)
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