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My guess… 

Set-up A: The air inside the flask gains heat from the 80 degree Celsius cloth, expands & pushes some of the water out of the tube. Hence the water level in the tube moves downwards. 

Set-up B: The air inside the flask loses heat to the O degree Celsius cloth, contracts & some water moves up the tube to occupy this space. Hence the water level in the tube moves upwards. 

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