A tank contains 70\displaystyle {70} kg of salt and 1000\displaystyle {1000} L of water. A solution of a concentration 0.035\displaystyle {0.035} kg of salt per liter enters a tank at the rate 7\displaystyle {7} L/min. The solution is mixed and drains from the tank at the same rate.

(a) What is the concentration of our solution in the tank initially?
concentration =   (kg/L)

(b) Find the equation for the amount of salt in the tank after t hours.
amount(t) =   (kg)

(c) Find the amount of salt in the tank after 1 hours.
amount =   (kg)

(d) Find the concentration of salt in the solution in the tank as time approaches infinity.
concentration =   (kg/L)

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