Apparent weight is weight in air minus upthrust of water
we need to know the volume of the object to give a perfect answer.but however to calculate,
upthrust= volumeof object*density of water *gravity(9.8)
apparent weight=current nmass in air-upthrust

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As the body is floating in water, it means the body is in equilibrium .

  weight m g = buoyancy force.

apparent weight =  weight in air - buoyancy force = 0 
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