SOLUTION: a tank holds 80 liters of a chemical solution. Currently, the solution has a strength of 30%. how much of this should be drained, and replaced with a 70% solution, to get a final s
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Question 783163: a tank holds 80 liters of a chemical solution. Currently, the solution has a strength of 30%. how much of this should be drained, and replaced with a 70% solution, to get a final strength of 40%? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = liters to be drained = liters of chemical in liters of solution
----------------------------------------------- liters of 30% solution are replaced with
liters of 70% solution = liters of chemical in 70% solution
Note that total liters of solution doesn't change
-------------------------------------- liters of chemical in liters of solution
20 liters should be drained & replaced with 70% solution
check:
OK
