Use Boyle's Law for this equation...?

Two gases are contained in gas bulbs connected by a valve. Gas A is present in a 1 liter bulb at a pressure of 848 torr. Gas B exerts a pressure of 258 torr in a 1 liter bulb. The valve is opened and the two gases equilibrate. What is the partial pressure of gas A expressed after equilibration? Answer in units of torr.