SOLUTION: Please help me in my hw :( 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 717804: Please help me in my hw :(

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?
Big thanks :*
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
.72*25+.80X=.75(25+X)
18+.80X=18.75+.75X
.80X-.75X=18.75-18
.05X=.75
X=.75/.05
X=15 LITERS OF 80% SOLUTION IS REQUIRED.
PROOF:
.72*25+.80*15=.75(25+15)
18+12=.75*40
30=30