Stuck on chemistry problem

Question

A gas has a volume of 200 mL at a pressure of 550 mmHg. If the temperature is held constant, what is the volume of the gas at a pressure of 750 mmHg?

Answer 1

This requires Boyle's Law which shows an inversely proportional relationship between volume and pressure.

(P1)(V1) =(P2)(V2)

P1 = 550 mm Hg

V1 = 200 mL

P2 = ?

V2 = 750 mm Hg

(550 mm Hg) (200 mL ) = (750 mm Hg) (V2)

V2 = 147 mL

This answer makes sense because the pressure decreased, which means the volume must have decreased.