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You and your friend are making 30 liters of sodium water. You have liters of 10% sodium and your friend has liters of 22% sodium. How many of your liters and how many of your friends liters should you mix to make 30 liters of 15% sodium?

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  1. Today, 08:22
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    X liters of 10% + (30 - x) liters of 22% = 30 liters of 15%

    Plugging in the numbers

    x (10) + (30 - x) 22 = 30 (15)

    Distribute

    10x + 660 - 22x = 450

    Combine like terms

    -12x = - 210

    Divide both sides by - 12

    x = 17.5

    30 - x = 12.5

    17.5 liters of 10% + 12.5 liters of 22% = 30 liters of 15%
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