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

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Question 179931: How much pure antifreeze must be added to 10 gal of 20% antifreeze to make a 50% antifreeze solution?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let x be the amount of pure antifreeze added
:
.2(10)+x=.5(10+x)
:
2+x=5+.5x
:
.5x=3
:
highlight%28x=6%29gallons of pure antifreeze