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An open$-$end mercury manometer is to be used to measure the pressure in an apparatus containing a vapor that reacts with mercury. A $16\mathrm{.}0-$ cm layer of silicon oil $(SG=0\mathrm{.}862)$ is placed on top of the mercury $(SG=13\mathrm{.}6)$ in the arm attached to the apparatus. Atmospheric pressure is $760mmHg.$ If the level of mercury in the open end is $365mm$ below the mercury level in the other arm, what is the pressure $)$ in the apparatus?

$mmHg$