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

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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(39618) About Me  (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:

5%2A50%2F%285%2Bv%29=20
Solve for v.