Three liquids of densities $d,\,2d$ and $3d$ are mixed in equal proportions of weights. The relative density of the mixture is
  • A$\frac{{11d}}{7}$
  • B$\frac{{18d}}{{11}}$
  • C$\frac{{13d}}{9}$
  • D$\frac{{23d}}{{18}}$
Medium
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