SOLUTION: A hospital staff mixed a 75% disinfectant solution with a 25% disinfectant solution. How many liters of each were used to make 20 L of a 45% disinfectant solution?

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Question 413408: A hospital staff mixed a 75% disinfectant solution with a 25% disinfectant solution. How many liters of each were used to make 20 L of a 45% disinfectant solution?
Answer by kamallohia(18) About Me  (Show Source):
You can put this solution on YOUR website!
We need to mix 2 parts of 75% solution with 3 parts of 25% solution to make 5 parts of 45% solution as 2*75 + 3*25 = 5*45.
So to make a 20L of 45% solution, we need to mix 8L of 75% solution and 12L of 25% solution.