SOLUTION: how many ml of water must be added to 50ml of 75% acid solution to make a 15% acid solution?

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Question 610689: how many ml of water must be added to 50ml of 75% acid solution to make a 15% acid solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = ml of water to be added
+.75%2A50+=+37.5+ ml of acid in 75% solution
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+37.5+%2F+%28+50+%2B+x+%29+=+.15+
+37.5+=+.15%2A%28+50+%2B+x+%29+
+37.5+=+7.5+%2B+.15x+
+.15x+=+37.5+-+7.5+
+.15x+=+30+
+x+=+200+
200 ml of water must be added
check:
+37.5+%2F+%28+50+%2B+200+%29+=+.15+
+37.5+=+.15%2A250+
+37.5+=+37.5+
OK