Solve the problem.In a chemistry class, 9 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?
A. 3.5 liters
B. 9.0 liters
C. 5.5 liters
D. 4.5 liters
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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?
?
A. solution: 
B. solution: 
C. solution: 
D. solution: 
E. solution: 
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