SOLUTION: How do I set up the table to find the solution to: how many milliliters of pure water must be added to 100ml of a 4% salt solution to make a 2.5% solution?

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Question 709788: How do I set up the table to find the solution to:
how many milliliters of pure water must be added to 100ml of a 4% salt solution to make a 2.5% solution?

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If you understand a formula, you can
set up a table
Let +w+ = ml of pure water to be added
+.04%2A100+=+4+ ml of salt in 4% solution
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+4+%2F+%28+w+%2B+100+%29+=+.025+
+4+=+.025%2A%28+w+%2B+100+%29+
+4+=+.025w+%2B+2.5+
+.025w+=+1.5+
+w+=+60+
60 ml of pure water must be added.
Note that there is no change in the amount of salt
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check answer:
+4+%2F+%28+60+%2B+100+%29+=+.025+
+4+%2F+160+=+.025+
+.025=+.025+
OK