A (g) ⇌ 2 B (g)+ C (g) For the given reaction, if the initial pressure is 450 mm Hg and the pressure at time t is 720 mm Hg at a constant temperature…

$$\mathrm{A}(g) \rightleftharpoons 2 \mathrm{~B}(g)+\mathrm{C}(g) $$ For the given reaction, if the initial pressure is $\displaystyle 450$ mm Hg and the pressure at time t is $\displaystyle 720$ mm Hg at a constant temperature T and constant volume V . The fraction of $\displaystyle \mathrm{A}(\mathrm{g})$ decomposed under these conditions is $\displaystyle x \times 10^{-1}$. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$ (nearest integer)