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Two mercury manometers, one open-ended and the other sealed-end, are attached to an air duct. The reading on the open-end is 25 mm and the reading on the sealed-end manometer is 800 mm (both can be read accurately within ±0.5 mm). Determine the absolute pressure in the duct, the gauge pressure in the duct and the atmospheric pressure, all in mm Hg.

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