SOLUTION: A tank holds 80 gallons of 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 stren
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Question 147290: A tank holds 80 gallons of 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 = amount of 30% solution to be drained and replaced with
70% solution
Currently, how much chemical is in the 30% solution? gallons
How much chemical will be in the amount drained off?
Then how much chemical will be in the solution that is put back in?
In words:
(amount of chemical I end up with) / (amount of solution I end up with) =
final strength of solution
20 gallons must be drained off and replaced with 70% solution
check answer:
OK
