Solve the problem.Chandra has 5 liters of a 40% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 8 liters of 28% solution?
A. 3 L of 8% solution
B. 3 L of 6% solution
C. 3 L of 11% solution
D. 3 L of 9% solution
Answer: A
Mathematics
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A. 5 log8 b - 8 log8 (c - 7)
B. 
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