A 100-gallon tank is full of a solution containing 25 pounds of a concentrate. Starting at time 
distilled water is admitted to the tank at the rate of 5 gallons per minute, and the well-stirred solution is withdrawn at the same rate.
(a) Find the amount Q of the concentrate in the solution as a function of 
by solving the differential equation 
(b) Find the time required for the amount of concentrate in the tank to reach 15 pounds.
A. a.
b.
min
?
B. a.
b.
min
?
C. a.
b.
min
?
D. a.
b. min
?
E. a.
b. min
?
Answer: E
Mathematics
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?
?
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Focus: 
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Focus: 
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