SOLUTION: how many of 35% alcohol must be mixed with 50% to make 2.5 liter of a 70% alcohol solution?

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Question 541763: how many of 35% alcohol must be mixed with 50% to make 2.5 liter of a 70% alcohol solution?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Not possible
two lower concentrations can never give a higher concentration