Two liquids having densities $d_1$ and $d_2$ are mixed in such a way that both have same mass. The density of the mixture is ............

  • A

    $\frac{d_1+d_2}{2}$

  • B

    $\frac{d_1+d_2}{d_1 d_2}$

  • C

    $\frac{d_1 d_2}{d_1+d_2}$

  • D

    $\frac{2 d_1 d_2}{d_1+d_2}$

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