Arturo O. answered 10/17/18
Experienced Physics Teacher for Physics Tutoring
The pressure units in the question are not correct. Pressure has units of force per area, A pound is a unit of force, not pressure. Anyway, use the relation
P1 V1 = P2 V2
P2 = P1 V1 / V2
Plug in P1, V1, and V2 in the correct units and get P2.