SOLUTION: in a chemistry class, 9 liters of a 40% 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 762411: in a chemistry class, 9 liters of a 40% 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 josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
{Amount of AgI}/{Amount of solution}={Concentration of AgI}

%289%2A40%2Bu%2A10%29%2F%289%2Bu%29=6
No!

How much water do you want the class to use? You cannot get less than 10% silver iodide using just solutions of 40% and 10%. The description needs more information. How much solution does the class need? Why does the question need the 10% solution for preparing this needed 6% solution?