SOLUTION: How many quarts of pure antifreeze must be added to 2 quarts of a 30% antifreeze solution to obtain a 40% antifreeze solution?

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Question 844082: How many quarts of pure antifreeze must be added to 2 quarts of a 30% antifreeze solution to obtain a 40% antifreeze solution?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How many +highlight_green%28x%29+quarts of pure antifreeze must be added to 

2 quarts of a 30% antifreeze solution to obtain a 40% antifreeze solution?

x + .30(2QT) = .40(2QT + x)

x + .30(2QT) = .40(2QT) + .40x

   .60x = .10(2Qt)

      x = .10(2Qt)/.60