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
Liquid is 
Text Solution
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(b, c)
Let the density of metal is 
and density of liquid is σ σ .
If V is the volume of sample then according to problem
........(i)
........(ii)
........(iii)
By solving (i), (ii) and (iii) we get 
and 
.
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