SOLUTION: How many liters of 400L of 20% NaCl solution must be replaced with 70% NaCl solution so that the resulting solution is 41%?

Question 736924: How many liters of 400L of 20% NaCl solution must be replaced with 70% NaCl solution so that the resulting solution is 41%?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 20% solution to be removed
Also, = liters of 70% solution to be added
= liters of NaCl removed
= liters of NaCl added
--------------
liters of NaCl are added
liters of NaCl to start with
--------------

168 liters of 400L of 20% NaCl solution must be
replaced with 70% NaCl solution
check:

OK
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