SOLUTION: A lab technician has 40 gallons of a 15% iodine solution. How many gallons of the 40% iodine solution must be added to make a 20% iodine solution?

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Question 885628: A lab technician has 40 gallons of a 15% iodine solution. How many gallons of the 40% iodine solution must be added to make a 20% iodine solution?
Answer by lwsshak3(11628) About Me  (Show Source):
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A lab technician has 40 gallons of a 15% iodine solution. How many gallons of the 40% iodine solution must be added to make a 20% iodine solution?
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let x=amt of 40% iodine solution must be added
..
40%x+15%*40=20%(x+40)
.40x+6=.20x+8
.20x=2
x=10
amt of 40% iodine solution must be added=10 gallons