Solve the problem.A tank initially contains 100 gal of brine in which 60 lb of salt are dissolved. A brine containing 4 lb/gal of salt runs into the tank at the rate of 8 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 5 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
+ 
y = 32
B. 
+ 
y = 20
C. 
= 32 - 
y
D. 
+ 
y = 32
Answer: A
Mathematics
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