SOLUTION: How many milliliters of water must be added to 60 mL of a 15% iodine solution in order to dilute it to a 10% solution?

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Question 430437: How many milliliters of water must be added to 60 mL of a 15% iodine solution in order to dilute it to a 10% solution?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.00x + 0.15*60 = 0.10*(x+ 60)
<==> 9 = 0.10x + 6
==> 3 = 0.10x
==> x = 30 ml of water should be added...