SOLUTION: Twenty liters of acid solution must be mixed with a 20% solution to get a 12% solution. How many liters of the 20% solution are needed?

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Question 891928: Twenty liters of acid solution must be mixed with a 20% solution to get a 12% solution. How many liters of the 20% solution are needed?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The problem description needs more information.

Twenty liters of acid solution of unknown y percent;
Present is 20% acid solution;
Wanted is 12% acid solution.

Let u = quantity of y% acid to mix with
v = quantity of 20% acid solution

highlight_green%28%28u%2Ay%2Bv%2A20%29%2F%28u%2Bv%29=12%29

THREE unknown variables but just ONE equation.
The description is missing information for y and for u.
You can solve the equation for v, but finding a value is not possible until you have the other information.