SOLUTION: how many quarts of pure antifreeze must be added to 7 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution

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Question 343456: how many quarts of pure antifreeze must be added to 7 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(10%)(7) + (100%)(x) = (30%)(7 + x)