A tank contains 50 gallons of a solution composed of 90% water and 10% alcohol.A second solution containing 50% water and 50% alcohol is added to the tank at the rate of 4 gallons per minute. At the second solution is being added, the tank is being drained at a rate of 5 gallons per minute, Assuming the solution in the tank is stirred constantly,how much alcohol is in the tank after 10 min?
