The volume of a gas is inversely proportional to the pressure. If a pressure of

30 pounds per square inch corresponds to a volume of 48 cubic feet, what pressure is needed to produce a volume of 60 cubic feet?

1 answer

since PV = k, a constant, you want P such that
60P = 48*30
or, since the volume is multiplied by 5/4, the pressure is multiplied by 4/5