In a chemistry class, 3 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?
(3*4+b*10)/(3+b) =6 Crossmultiplying 3*4+b*10=6(3+b). 12+10b=18+6b; 10b=6+6b; 4b=6; b=3/2. Thus we need 1.5 liters of 10% solution.
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