Two tanks containing air are connected via a valve. The first tank is 0.5 m3 and contains air at T = 25 oC and P = 500 kPa. The second tank contains 1 kg of air at T = 35 oC and P = 200 kPa. The valve connecting the tanks is opened and the gas pressure is allowed to equalize. The two tanks are then cooled to T = 20oC. What is the final equilibrium pressure of the air in the two tanks?