SOLUTION: A 12 litre solution is 331/3% acid. How much water should be added to get the solution 20% acid?

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Question 884311: A 12 litre solution is 331/3% acid. How much water should be added to get the solution 20% acid?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = liters of water to be added
+12%2A.333+=+4+ liters of acid
in 33 1/3 % solution
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+4+%2F+%28+x+%2B+12+%29+=+.2+
+4+=+.2%2A%28+x+%2B+12+%29+
+4+=+.2x+%2B+2.4+
+.2x+=+1.6+
+x+=+8+
8 liters of water need to be added