Solve the Problem $V$ Of a Gas Varies Inversely as the Pressure

Multiple Choice

Solve the problem.
-The volume $V$ of a gas varies inversely as the pressure $P$ on it. The volume of a gas is $300 \mathrm{~cm}^{3}$ under a pressure of $31 \mathrm{~kg} / \mathrm{cm}^{2}$ . Find an equation of variation.

A) $\mathrm{V}=\frac{9300}{\mathrm{P}}$
B) $\mathrm{V}=\frac{\mathrm{P}}{9300}$
C) $\mathrm{V}=9300 \mathrm{P}$
D) $\mathrm{V}=\frac{1}{\mathrm{P}}$