SOLUTION: How many pints of a 35% iodine solution must be added to 20 pints of a 15% iodine solution to obtain a 20% iodine solution?

Question 228060: How many pints of a 35% iodine solution must be added to 20 pints of a 15% iodine solution to obtain a 20% iodine solution?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How many pints of a 35% iodine solution must be added to 20 pints of a 15% iodine solution to obtain a 20% iodine solution?
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Equation:
iodine + iodine = iodine
0.15*20 + 0.35x = 0.20(20+x)
Multiply thru by 100 to get:
15*20 + 35x = 20*20 + 20x
15x = 5*20
x = 20/3 = 6 1/3 pints (amt. of 35% solution needed in the mixture)
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Cheers,
Stan H.
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