SOLUTION: How many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution?

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Question 361703: How many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 90% solution.
90A%2B15%286%29=40%28A%2B6%29
90A%2B90=40A%2B240
50A=150
highlight%28A=3%29liters