J.R. S. answered 01/12/22
Ph.D. University Professor with 10+ years Tutoring Experience
With all else being constant (such as moles, temperature, etc), we have...
P1V1 = P2V2
P1 = initial pressure = 90 kPa
V1 = initial volume = 600 mls
P2 = final pressure = 150 kPa
V2 = final volume = x mls
(90 kPa)(600 mls) = (150 kPa)(x mls)
x = 360 mls