SOLUTION: In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?

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Question 310598: In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10%
solution to get a 6% solution. How many liters of the 10% solution are needed?

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the liters of 10% solution.
4%287%29%2B10%28X%29=6%287%2BX%29
28%2B10X=42%2B6X
4X=14
X=7%2F2=3.5
3.5 liters of 10% solution will mix to give a 6% solution.