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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 15% orange juice?

  • math -

    if x is 30% then the rest (20-x) is 10%. So,

    .30x + .10(20-x) = .15(20)
    x = 5

    So, 5L of 30% and 15L of 10%

    Note how 15% is 3/4 of the way from 30% to 10%, so 3/4 of the mix is the 10% kind.

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