SOLUTION: A tank holds 140 liters of checmical solution. Currently the solution has a strength of 60%. How much of this should be drained and replaced with 100% solution to get a final str
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Question 658888: A tank holds 140 liters of checmical solution. Currently the solution has a strength of 60%. How much of this should be drained and replaced with 100% solution to get a final strength of 80%? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! For clarity, I'll just suppose the solution
is water plus antifreeze, so it's 60%
antifreeze.
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given: liter of antifreeze in 60% solution
Let = liters of 60% antifreeze to be drained
and repaced with 100% antifreeze
( note there is 140 liters when you start
and 140 liters when you finish )
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70 liters of solution must be drained and
replaced with 100% solution
