SOLUTION: How many liters of a 20% chemical solution must be mixed with 6 liters of a 15% chemical solution to give a 10% solution?

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Question 516521: How many liters of a 20% chemical solution must be mixed with 6 liters of a 15% chemical solution to give a 10% solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Adding 20% to 15% will increase the concentration. Any mix will be between 15% and 20%, 10% is not possible.