SOLUTION: A 10L of brine solution of 25% pure salt How much water must be added to produce a solution which is 20% salt

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Question 1020434: A 10L of brine solution of 25% pure salt
How much water must be added to produce a solution which is 20% salt
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = L of water to be added
+.25%2A10+=+2.5+ L of salt in 25% solution
-------------------
+2.5+%2F+%28+w+%2B+10+%29+=+.2+
+2.5+=+.2%2A%28+w+%2B+10+%29+
+2.5+=+.2w+%2B+2+
+.2w+=+.5+
+w+=+2.5+
2.5 L of water must be added
------------------------
check:
+2.5+%2F+%28+w+%2B+10+%29+=+.2+
+2.5+%2F+%28+2.5+%2B+10+%29+=+.2+
+2.5+%2F+12.5+=+.2+
+2.5+=+2.5+
OK