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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