A sample of metal weighs $210 gm$  in air, $180 gm$  in water and $120 gm$  in liquid. Then relative density $(RD) $ of

  • A

    Metal is $3$ 

  • B

    Metal is $7$ 

  • C

    Liquid is $3$ 

  • D

    Both $(b) $ and $(c)$ 

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