Solve the problem.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?
A. 3.5 L
B. 7.0 L
C. 4.5 L
D. 2.5 L
Answer: A
Mathematics
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A. -2, -1 ± 
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