SOLUTION: Forty liters of a 60% disinfection solution are to be mixed with a 10% solution to dilute it to a 20% solution. How much of the 10% solution must be used?

Question 697645: Forty liters of a 60% disinfection solution are to be mixed with a 10% solution to dilute it to a 20% solution. How much of the 10% solution must be used?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Forty liters of a 60% disinfection solution are to be mixed with a 10% solution to dilute it to a 20% solution.
How much of the 10% solution must be used?
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Equation:
dis + dis = dis
0.60*40 + 0.10x = 0.20(40+x)
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60*40 + 10x = 20*40 + 20x
10x = 40*40
x = 160 liters (amt of 10% solution needed)
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Cheers,
Stan H.
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