SOLUTION: how many liters of water must be added to 30L of a 30% acid solution in order to produce a 20% acid solution?

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Question 699001: how many liters of water must be added to 30L of a 30% acid solution in order to produce a 20% acid solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
There is no change in the quantity of acid
+.3%2A30+=+9+ liters of acid in 30% solution
Let +x+ = liters of water to be added
-----------
+9+%2F+%28+x+%2B+30+%29+=+.2+
+9+=+.2%2A%28+x+%2B+30+%29+
+9+=+.2x+%2B+6+
+.2x+=+3+
+x+=+15+
15 liters of water must be added
check:
+9+%2F+%28+15+%2B+30+%29+=+.2+
+9+%2F+45+=+.2+
+9+=+.2%2A45+
+9+=+9+
OK