A body weights $200 gm$ in air $180 gm$ in a liquid and $175 gm$ in water. The density of the material of the body is

V= Volume of body

 $$\begin{gathered} 1\times v\times g=200-175 \\ vg=25 ........\left(1\right) \\ mg =200 \\ {\rho }_{b}Vg=200 .......\left(2\right) \\ Putting value of vg in \left(2\right) \\ {\rho }_b\left(25\right)=200 \\ {\rho }_b=8 g/c{m}^{-3} \\ =8000 kg/m^{-3} \end{gathered}$$