Solve the Problem $\mathrm { V } = 392.0 \mathrm { in. } ^ { 3 }$

Solve the problem.
-The volume V of a given mass of gas varies directly as the temperature T and inversely as the pressure P. If $\mathrm { V } = 392.0 \mathrm { in. } ^ { 3 }$ when $\mathrm { T } = 420 ^ { \circ }$ and $\mathrm { P } = 15 \mathrm { lb } / \mathrm { in } ^ { 2 }$ what is the volume when $\mathrm { T } = 200 ^ { \circ }$ and $\mathrm { P } = 15 \mathrm { lb } / \operatorname { in } ^ { 2 } ?$

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