Question: please answer and choose the correct answer of the question: A tank that contains 20 gal of water in which 3 kg of salt has

please answer and choose the correct answer of the question:

A tank that contains 20 gal of water in which 3 kg of salt has been dissolved completely is to be filled by a hose with water carrying 0.25 kg/gal of salt at a rate of 4 gal/min. The mixture is then stirred and the solution is being pumped out at the same rate. Find the function of salt in the tank at any given time. * (3 Points) O S (t) = 5 -2e-0.21 kg O S (t) = 2 - 5e-0.21 kg

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