SOLUTION: How many liters of 80% salt solution would we need to mix with 12 liters of 30% salt solution to produce a 40% salt solution as a result?

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Question 358002: How many liters of 80% salt solution would we need to mix with 12 liters of 30% salt solution to produce a 40% salt solution as a result?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 80% solution.
80A%2B30%2812%29=40%28A%2B12%29
80A%2B360=40A%2B480
40A=120
highlight%28A=3%29liters.