Algebra-2

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

Key Concept Explanation
The initial amount of acid in the mixture is 30% of 50 liters, which is 15 liters. Let be the amount of pure water to be added. The new concentration is given by the ratio of the amount of acid to the total volume of the new mixture.

Step-by-step Solution
1. Determine the initial amount of acid: liters
2. Let be the amount of pure water to be added.
3. Write the equation for the new concentration:
4. Solve for :

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