SSC JE Mechanical Engineering 2017 Set 2 Paper

The relative density of an object is equal to the ratio of its weight in air and the difference of its weight in air and its weight when the object is submerged in water.
$\mathit{D}=\left[\frac{\left({\mathit{W}}_{\mathit{a}}\right)}{\left({\mathit{W}}_{\mathit{a}}-{\mathit{W}}_{\mathit{w}}\right)}\right]$ From the given data $\mathit{D}=\left[\frac{60}{\left(60-50\right)}\right]$
⇒ D = $\left(\frac{60}{10}\right)$ ⇒ D = 6 Relative density of oil can be calculated as,
⇒ Relative density of oil
⇒ Relative density of oil $=\frac{\left(60-40\right)}{\left(60-50\right)}$
⇒ Relative density of oil $=\frac{20}{10}$
⇒ Relative density of oil = 2