SOLUTION: The radiator contains 12 gal of h2o.we draw off 3 gal and replace it w/ alcohol,then draw off 3 gal of mixture and replace w/ alcohol.etc, until 8 drawings and replacement made. Ho

Algebra ->  Test -> SOLUTION: The radiator contains 12 gal of h2o.we draw off 3 gal and replace it w/ alcohol,then draw off 3 gal of mixture and replace w/ alcohol.etc, until 8 drawings and replacement made. Ho      Log On


   

Question 581505: The radiator contains 12 gal of h2o.we draw off 3 gal and replace it w/ alcohol,then draw off 3 gal of mixture and replace w/ alcohol.etc, until 8 drawings and replacement made. How much alcohol is the final mixture?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
each successive mixture has 3/4 (9/12) the amount of water (H2O) as the previous mixture

the H2O in the final mixture is ___ 12 * (3/4)^8

the amount of alcohol is 12 gal MINUS the amount of H2O