The total pressure of a mixture of non-reacting gases X (0.6 g) and Y(0.45 g) in a vessel is 740 mm of Hg. The partial pressure of the gas X is _____ mm of Hg. (Nearest Integer)
(Given: molar mass X=20 and $\left.\mathrm{Y}=45 g {\mathrm{mol}}^{-1}\right)$