An expansible ballon filled with air floats on the surface of a lake

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An expansible ballon filled with air floats on the surface of a lake with 2/3 of its volume submerged .How deep must it be sunk in the water so that it is just inequilibrium neither sinking further nor rising? It is assumed that the temperature of the water is constant and that the height of water barometer is 9 meters.

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