Answer:
Set X = volume (liters) of the 20% solution. Now you have a simple algebraic equation.
.20 X + .80 (100-X) = .62 (100)
Solve for X. 100-X is the volume of the 80% solution
.1 v + (100-v).4 = 62
.6 v = 22
or v = 36.33
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