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Initially, there are two large tanks, A and B, each with
100 gallons of brine. The perfectly mixed liquid
pumps between the tanks as illustrated in the figure. Use the information
given in the figure to build a mathematical model of the
number of pounds of salt x1(t) and x2(t) contained at time t in the
tanks A and B, respectively.

Mezcla
2 Ib/gal
7 gal/min
5 gal/min
A
B
100 gal
100 gal
Mezcla
Mezcla
Mezcla
3 gal/min
1 gal/min
4 gal/min

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but why we dont consider a thickness of mass dm ? ( of a disk)
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