Two large tanks, each holding 100 L of liquid, are interconnected by pipes, with the liquid flowing from tank A into tank B at a rate of 4 L/min and from B into A at a rate of 1 L/min. The liquid inside each tank is kept well stirred. A brine solution with a concentration of 0.3 kg/L of salt flows into tank A at a rate of 8 L/min. The (diluted) solution flows out of the system from tank A at 5 L/min and from tank B at 3 L/min. If initially, tank A contains pure water and tank B contains 30 kg of salt, determine the mass of salt in each tank at time t20. 8 L/min - 0.3 kg/L- 5 L/min - A x(t) 100 L x(0) = 0 kg 4 L/min 1 L/min What is the solution to the system? x(t)= y(t) = B y(t) 100 L y(0) = 30 kg 3 L/min Q G

How many license plates can be made using either two or three letters followed by either two or three digits and contain no letter or digit twice?

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