Average of $a, b$ and $c$ is $11 ;$ average of $c, d$ and $e$ is $17 ;$ average of $e$ and $f$ is $22$ and average of $e$ and $c$ is $17 .$ Find out the average of $a, b,$ $c , d , e$ and $f ?$

  • A

    $15 \frac{2}{3}$

  • B

    $18 \frac{1}{2}$

  • C

    $21 \frac{1}{3}$

  • D

    $16 \frac{1}{2}$

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