I have no idea what to do for this. The equation is supposed to model a solution having salty water dumped into a tank that leaks the solution.
? A tank contains 1000L of pure water. Brine that contains .05 kg of salt per liter of water enters the tank at a ra te of 5L/min. Brine that contains .04 kg of salt per liter of water enters the tank at a rate of 10L/min. The solution is kept thoroughly mixed and drains from the tank at a rate of 15L/min. From Stewart Calculus 7e
I am supposed to find the salt at t minutes and at one hour.
I try to simplify this problem by making it .07kg per lit of water at 5L/m and from here I have no idea how to make an equation for this.