How many liters of a 30% saline solution must be added to 4 liters of a 15% saline solution to obtain a 25% saline solution?
Question
Solution 1
Let's denote the amount of the 30% saline solution that needs to be added as x liters.
The total amount of salt in the final solution is the sum of the salt in the 15% solution and the salt in the 30% solution.
In the 4 liters of 15% solution, there are 0.15 * 4 = 0.6 liters of salt.
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