SOLUTION: How many liters each of a 3% chlorine solution and 5% chlorine solution must be mixed toghether to produce 500L of a 4.4% chlorine solution?

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Let T be the number of liters of 3% solution.
Let F be the number of liters of 5% solution.
Then,
Volume equation:
1.
Concentration equation:

2.
From eq. 1,


Substitute into eq. 2 and solve for F.





Then from eq. 1,


.
.
.
165 liters of 3% solution and 385 liters of 5% solution.