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2015-01-12T16:19:06+05:30

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Relative density of liquid

     = density of liquid / density of water
     = buoyancy force in liquid / buoyancy force in water
     = Loss of weight in liquid / loss of weight in water
     = [ weight of object  in air - weight of object in liquid ] / [ weight of object in air - weight of object in water ]

     = [ 75 - 70.5 ] / [ 75 - 66 ]
     = 4.5 / 9
     = 0.5

Density of liquid = 0.5 * density of water
             = 0.5 * 1000 kg / m^3
                 =  500 kg/m^3

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2015-01-13T09:15:22+05:30
Relative density of liquid

     = density of liquid / density of water
     = [ weight of object  in air - weight of object in liquid ] / [ weight of object in air - weight of object in water ]
so using this derivation caliculate the answer
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