SOLUTION: how many gallons of a 80% anitfreeze solution must be mixed with 100 gallons of 25% antifreeze to get mixture that is 70% antifreeze?

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Question 360984: how many gallons of a 80% anitfreeze solution must be mixed with 100 gallons of 25% antifreeze to get mixture that is 70% antifreeze?
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%2B25%28100%29=75%28A%2B100%29
80A%2B2500=75A%2B7500
5A=5000
highlight%28A=1000%29gallons