SOLUTION: how many gallons of 50% antifreeze solution must be mixed with 90 gallons of 20% antifreeze to get a mixture that is 40% antifreeze?

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Question 876693: how many gallons of 50% antifreeze solution must be mixed with 90 gallons of 20% antifreeze to get a mixture that is 40% antifreeze?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
Learn to understand this kind of mixture problem in this lesson:
Mixture: one material quantity unknown

Let v = how many gallons of 50% to add.
highlight%28%2850v%2B20%2A90%29%2F%28v%2B90%29=40%29
Solve for v.