Solve the problem.Suppose a tank contains 100 gallons of a solution of 10 lb of salt dissolved in water, which is kept uniform by stirring. Pure water is allowed to flow into the tank at a rate of 3 gallons per minute, and the mixture flows out at a rate of 2 gallons per minute. How much salt is present in the tank after 40 minutes?
A. Approx. 5.9 lb
B. Approx. 6.9 lb
C. Approx. 5.1 lb
D. Approx. 8.3 lb
Answer: C
Mathematics
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A. 
B. 
C. 216p
D. 
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A. 
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C. 
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