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a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution?
Enter two numbers separated by a comma

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    x liters of 18% acid has .18x liters of acid
    y liters of 36% acid has .36y liters of acid

    24 liters of 30% acid has .24*30 liters of acid

    x+y = 24

    .18x + .36(24-x) = .30*24
    .18x + 8.64 - .36x = 7.2
    .18x = 1.44
    x = 8

    so, 8L of 18% + 16L of 36% = 24L of 30%

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