A tank holds 52 gallons of water. Initially, at t = 0, a solution containing 1/6 lb/gal of a chemical solvent flows into the tank at a rate of 5 gal/min The mixture then leaves the tank at the same rate. The amount of chemical (water with solvent) at any instant t, inside the tank, corresponds to 26 O a) (1 + e /52) 3 26 O b) 3 (1-e 4/32) 25 c) (1+e 5/52) 312 25 d) 312 (1 – e s4/32)

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