SOLUTION: a 25 liter solution of alcohol in water is 72% alcohol.How many liters of an 80% solution must be added if the final solution is to be 75% alcohol?

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Question 419023: a 25 liter solution of alcohol in water is 72% alcohol.How many liters of an 80% solution must be added if the final solution is to be 75% alcohol?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
25(.72)+.80p=.75(25+p)
18+.80p=18.75+.75p
.05p=.75
p=.75/.05=15
You need 15 liters of .8 alcohol for your solution..