SOLUTION: How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution to obtain a mixture which is 25% alcohol? All percentage are by volume. please help me.....

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Question 667809: How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution to obtain a mixture which is 25% alcohol? All percentage are by volume.
please help me.....

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 
Hi,
How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution
to obtain a mixture which is 25% alcohol?
Mixing Algebraically
x + .15·10qt = .25(10+x) || Solve for x
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