SOLUTION: how many milliliters of water must be added to 250 ml of 25% salt solution to reduce the concentration to 10%

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Question 511311: how many milliliters of water must be added to 250 ml of 25% salt solution to reduce the concentration to 10%
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let w = ml of water to be added
given:
+.25%2A250+=+62.5+ ml of salt in 25% solution
+62.5+%2F+%28+250+%2B+x+%29+=+.1+
+62.5+=+.1%2A%28+250+%2B+x+%29+
+62.5++=+25+%2B+.1x+
+.1x+=+62.5+-+25+
+.1x+=+37.5+
+x+=+375+
375 ml of water must be added