?A 200-gallon tank is full of a solution containing 55 pounds of concentrate. Starting at time 
, distilled water is added to the tank at a rate of 20 gallons per minute, and the well-stirred solution is withdrawn at the same rate. Find the amount of concentrate Q in the solution as a function of ?t.
?
A. ?
B. ?
C. ?
D. ?
E. ?
Answer: A
Mathematics
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