SOLUTION: I can't seem to find the solution to this problem. I would appreciate some guidance. Thank you. A solution containing 30% insecticide is to be mixed with a solution containing 50%

Question 130317: I can't seem to find the solution to this problem. I would appreciate some guidance. Thank you. A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solution containing 42% insecticide. How much of the 50% insecticide solution should be used? liters
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
let x="liters of 50%", so 200-x="liters of 30%"

x(50%)+(200-x)(30%)=200(42%) __ .5x+60-.3x=84 __ .2x=24
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