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A tube 2m long and closed at on e end is...

A tube 2m long and closed at on e end is half filled with mercury and is then inverted with its open end just dipping into a mercury trogy. Find the height of mercury which will stand in the tube if the reading of the barometer is o.75 m.
[hint: `P_(1) = 0.765,V_(1)= 1 propm^(3), P_(2)=(3//4-x),V_(2)= (2-x)prop m^(3),use p_(1)V_(2)=P_(2)V_(2).]`

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