SOLUTION: a tank holds 20 L of a chemical solution, with a current strength of 60%. how much must be replaced with 100% solution to get a final strength of 80%

Question 831055: a tank holds 20 L of a chemical solution, with a current strength of 60%. how much must be replaced with 100% solution to get a final strength of 80%
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
This is only a partial explanation for solving the example problem.

Remove and replace a volume quantity, v liters of the solution in the tank.
is the amount of chemical ( as if 100%) in the tank; then will add to maintain the original volume with the pure solution at 100% strength, so you will have amount of pure chemical in the tank.

Working with the accounting of pure chemical in the solution in the tank,

, amount of resulting pure chemical in the tank
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