General Chemistry help 14.37

Consider the reaction: 
Br2(g)+Cl2(g)⇌2BrCl(g)
Kp=1.11×10−4 at 150 K.
A reaction mixture initially contains a Br2 partial pressure of 770 torr and a Cl2 partial pressure of 740 torr at 150 K.

Calculate the equilibrium partial pressure of BrCl.