SOLUTION: How many liters of water must be added to a 70 liter of a 40% aid solution in order to produce a 28% acid solution?

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Question 593021: How many liters of water must be added to a 70 liter of a 40% aid solution in order to produce a 28% acid solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water needed
+.4%2A70+ = acid in 40% solution
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+%28+.4%2A70%29+%2F+%28+70+%2B+w+%29+=+.28+
+28+=+.28%2A%28+70+%2B+w+%29+
+70+%2B+w+=+100+
+w+=+30+
30 liters of water is needed