SOLUTION: a solution containing 28% fungicide is to be mixed with a solution containing 40% fungicide to make 300L of a solution containing 36% fungicide. how much of each solution should b

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Question 355465: a solution containing 28% fungicide is to be mixed with a solution containing 40% fungicide to make 300L of a solution containing 36% fungicide. how much of each solution should be used?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 28% fungicide and let B be the amount of 40% fungicide.
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.
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Volume:
1.A%2BB=300
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Concentration:
28A%2B40B=36%28300%29
2.7A%2B10B=2700
Multiply eq. 1 by (-10) and add to eq. 2 to eliminate B and solve for A.
-10A-10B%2B7A%2B10B=-3000%2B2700
-3A=-300
highlight%28A=100%29liters
Then from eq. 1,
100%2BB=300
highlight%28B=200%29liters