a barrel contains 100 liters of a strong salt solution whose concentration is 200 grams per liter. a more dilute salt solution of concentrate 2 grams per liter is added to the barrel at a rate of 10 liters per minute, and the outflow from the barrel is 5 liters per minute. calculate the minimum amount of salt in the barrel and the time when it occurs. (of course you will need to assume that there is some kind of constant
