SOLUTION: How much pure iodine must be added to 250 mL of 8% iodine solution to get a 20% iodine solution? Please help me, I am confused on how to do this.

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Question 216262: How much pure iodine must be added to 250 mL of 8% iodine solution to get a 20% iodine solution?
Please help me, I am confused on how to do this.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How much pure iodine must be added to 250 mL of 8% iodine solution to get a 20% iodine solution?
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Equation:
iodine + iodine = iodine
0.08*250 + x = 0.20(x+250)
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Multiply thru by 100 to get:
8*250 + 100x = 20x + 20*250
80x = 12*250
x = 3.75 mL (amount of pure iodine needed for the mixture)
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Cheers,
Stan H.