Answers

2014-03-19T18:15:48+05:30
Relative density of a object =  \frac{ W_{a} }{ W_{a} - W_{u} }
=80/(80-64)
=80/16
=5
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2014-03-23T21:20:38+05:30
RD = Wt of air of object / Wt of the air - wt of the water 

ans = 5

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