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One canned juice drink is 30% orange juice, another is 10% orange juice. How many liters of each should be mixed together in order to get 20L that is 18% orange juice?

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    oj in x liters of 30% = .3x
    oj in (20-x) liters of 10% = .1(20-x)
    oj in 20 liters of 18% = .18(20)

    .3x + .1(20-x) = .18(20)
    .3x + 2 - .1x = 3.6
    .2x = 1.6
    x = 8

    so, 8L of 30% + 12L of 10% = 20L of 18%

    8*.3 + 12*.1 = 2.4+1.2 = 3.6 = .18*20

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