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.....

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> 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.....       Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How many quartshighlight%28x%29 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