:-In an oil refinery, a storage tank contains 200 gal of gasoline that initially has 100 Ib of an additive dissolved in it. In preparation for winter weather, gasoline containing 2 lb of additive per gallon is pumped into the tank at a rate of 40 gal min. The well- mixed solution is pumped out at a rate of 45 gal min. How much of the additive is in the tank 20 min after the pumping process begins (Figure.1) Hint: use this equation.(rate out = x outflowrate) y(t) v(t) 40 gal/min containing 2 lb/gal 45 gal/min containing lb/gal

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