2 cubic feet tank contains gas at 1000 psig and at 60 fahrenhiet.this tank is connected to another tank.?

2 cubic feet tank contains gas at 1000 psig and at 60 fahrenhiet.this tank is connected to another tank of UNKNOWN volume containing the same gas at 14.7 psia and 60 fahrenhiet.The two tanks are allowed to come to equilibrium, and when this is accomplished and pressure is 650 psig and the temperature is 60 fahrenhiet.what is the volume of the tank?Atmospheric pressure is 17.7 psia.ume gas behaves as an ideal perfect gas.