Algebra-2

Question Analysis
This problem assesses the ability to set up and solve a rational equation in a real-world context involving mixtures and concentrations.

Key Concept Explanation
The key concept involves setting up an equation based on the initial and final concentrations of the solution.

Step-by-step Solution
1. Let be the amount of pure water to be added.
2. The initial amount of acid is liters.
3. The final volume of the solution is liters.
4. The final concentration is 20%, so the equation is .
5. Solve for :

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