SOLUTION: how many quarts of pure antifreeze must be added added to 9 quarts of a 40% antifreeze solution to obtain a 50% antifreeze solution

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Question 327252: how many quarts of pure antifreeze must be added added to 9 quarts of a 40% antifreeze solution to obtain a 50% antifreeze solution
Answer by galactus(183) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=amount of pure antifreeze.
When we add this to the 9 quarts of the 40%, we have 9+x quarts.
So, we have:
x+.4(9)=.5(9+x)
Solving for x gives x=1.8 quarts of pure antifreeze.