SOLUTION: Howw many liters of pure water should be mixed with a 5L solution of 50% acid to produce a mixture that is 80% water

Question 784979: Howw many liters of pure water should be mixed with a 5L solution of 50% acid to produce a mixture that is 80% water
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
This must assume the concentrations are volume per volume.

Let v = volume of water to add, in liters.
80% water would be consistent with 20% acid.
The equation will be arranged according to concentration of acid, although it could be done according to the water:

Solve for v.
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