SOLUTION: How much antifreeze must be added to a 10 gallon of 20% antifreeze to make 50% antifreeze solution?

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Question 102326: How much antifreeze must be added to a 10 gallon of 20% antifreeze to make 50% antifreeze solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
10 gallons of 20% antifreeze have 10+x+20%2F100 or 2 gallons of antifreeze, that's 20% antifreeze, 80% water.
So you currently have 2 gallons of antifreeze and 8 gallons of water.
For a 50% solution, you need 50% water and 50% antifreeze.
You have 8 gallons of water so you need 8 gallons of antifreeze for a 50% solution.
You have 2 gallons of antifreeze.
You need 8 gallons of antifreeze.
You need to add8-2+ gallons of antifreeze.
Your answer is 6 gallons.