SOLUTION: How many gallons of 50% antifreeze solution must be mixed with 100 gallons of 20% antifreeze solution to get 40% antifreeze solution?

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Question 380379: How many gallons of 50% antifreeze solution must be mixed with 100 gallons of 20% antifreeze solution to get 40% antifreeze solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 50% solution.
50A%2B20%28100%29=40%28A%2B100%29
5A%2B200=4A%2B400
highlight%28A=200%29gallons