Question 758135
You're mixing an unknown volume of 25% solution with an unknown volume of a 75% solution to create a 14 liters of a 50% solution.

0.25x + 0.75x = 0.50 (14)
 
            x = 7

so 0.25x = (0.25 * 7) = 1.75 liter

and 0.75x = (0.75 * 7) = 5.25 liter

This make 7 (1.75 + 5.25)liters of the correct solution, but we need 14 liters.

So, we simply double the amount of each, as follows:

2 * 1.75 Liter = 3.5 liter of the 25% solution, and

2 * 5.25 liter = 10.5 liter of the 75% solution.

Answer: 3.5 Liter of 25% solution and 10.5 liter of 75% solution.