Two mercury manometers, one open-end and the other sealed-end, are attached to an air duct

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Two mercury manometers, one open-end and the other sealed-end, are attached to an air duct. The reading on the open-end manometer is 25 [mm] and that on the sealed-end manometer is 800 [mm]. Determine the absolute pressure in the duct, the gauge pressure in the duct, and the atmospheric pressure, all in (mm Hg).