physics

A uniform vertical glass tube open at the lower end and sealed at the lower end is lowered into sea water thus trappung the air int he tube . It is observed that when the tube is submerged to a depth 10 meters the sea water has entered the lower half of the tube . To what depth must the tube be lowered so that the sea water fill three quarters of the tube?

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asked by emily
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    posted by jbil

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