SOLUTION: I have 200 gallons of 89 proof alchol. How much h2o should I add to get it to 80 proof!

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Question 865580: I have 200 gallons of 89 proof alchol. How much h2o should I add to get it to 80 proof!
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
89 proof is 89/2%=.445
.445*200=.40*(200+x)
x = 22.5 gallons of water.