Three liquids of densities $d,\,2d$ and $3d$ are mixed in equal proportions of weights. The relative density of the mixture is
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(b) ${\rho _{mix}}$= $\frac{{3m}}{{{V_1} + {V_2} + {V_3}}} = \frac{{3m}}{{\frac{m}{d} + \frac{m}{{2d}} + \frac{m}{{3d}}}}$= $\frac{{3 \times 6}}{{11}}d = \frac{{18}}{{11}}d$
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