A container initially contains 15 L of water in which there is 30 g of salt dissolved. A solution containing 4 g/L of salt is pumped into the container at a rate of 3 L/min, and the well-stirred...

A container initially contains 15 L of water in which there is 30 g of salt dissolved. A solution containing 4 g/L of salt is pumped into the container at a rate of 3 L/min, and the well-stirred mixture runs out at a rate of 2 L/min. How much salt is in the tank after 35 minutes?