Three liquids of densities $d,\,2d$ and $3d$ are mixed in equal volumes. Then the density of the mixture is
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(b) ${\rho _{mixture}}$= $\frac{{{m_1} + {m_2} + {m_3}}}{{3V}} = \frac{{V(d + 2d + 3d)}}{{3V}}$ $= 2d.$
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