SOLUTION: How many kilograms of water must be added to 80kg of a 60% iodine solution in order to dilute a 40% iodine solution?

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Question 707384: How many kilograms of water must be added to 80kg of a 60% iodine solution in order to dilute a 40% iodine solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many kilograms of water must be added to 80kg of a 60% iodine solution in order to get a 40% iodine solution?
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Equation:
water + water = water
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0.40*80 + 1*x = 0.60(80+x)
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40*80 + 100x = 60*80+ 60x
40x = 20*80
x = 40 kg (amt. of water to add)
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Cheers,
Stan H.