How many liters each of 12% iodine solution...

Question

How many liters each of 12% iodine solution and a 30% iodine solution must be used to produce a total mixture of 90 liters of a 22% iodine solution?

Answer 1

If S is the amt of 12% and L the amt of 30%, then the equations are

S + L = 90

.12S + .3L = .22*90

You can use either elimination or substitution to find the solution.