SOLUTION: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 90% antifreeze?

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Question 659295: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 90% antifreeze?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+1+%2F+%28+1+%2B+x%29+=+.9+
+1+=+.9%2A%28+1+%2B+x+%29+
+1+=+.9+%2B+.9x+
+.9x+=+.1+
+x+=+1%2F9+
1/9 of a gallon of water must be added