A piece of solid weights 120g in air, 80g in water and 60g in a liquid. The relative density of the solid and that of the liquid are respectively

Relative density of solid $=\frac{\mathrm{weight} \mathrm{in} \mathrm{air}}{\mathrm{weight} \mathrm{in} \mathrm{air}-\mathrm{weight} \mathrm{in} \mathrm{water}}$

$\therefore$Relative density of solid $=\frac{120}{120-80}=3$

Relative density of liquid $=\frac{\mathrm{weight} \mathrm{in} \mathrm{air}-\mathrm{waight} \mathrm{in} \mathrm{liquid}}{\mathrm{weight} \mathrm{in} \mathrm{air}-\mathrm{weight} \mathrm{in} \mathrm{water}}$

$\therefore$Relative density of liquid $=\frac{120-60}{120-80}=\frac{3}{2}$