A tank contains 50-liters of brine in which 20 grams of salt is dissolved. Pure water is being pumped into the tank at a rate of 5 liters/min., the solution is continuously stirred and the well-mixed solution is pumped out at 4 liters/min. Which of the following initial-value problems must be solved to find the amount of salt x= x(t) in the tank at time t? dx A 4x ; x(0) =20 dt 50 +t dx B -; x(0) =20 50 +t dt dx 5 dt X x(0) = 20 50 +t dx 2x dt 25 X(0) =20

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