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how many liters of water must be added to 30 liters of a 20% alcohol solution to dilute it to a 15% solution?

  • math -

    you are diluteing it 20/15=1.333 times

    Add one part solution, .333333 water.

    This means if one part is 30 liters, add 10 liters water.

    Check: .2*30/(40+10)=6/40=.15 or 15 percent.

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