The average salary of all the workers in a workshop is $Rs.\,8000.$ The average salary of $7$ technicians is $Rs.\, 12000$ and the average salary of the rest is $Rs.\,6000 .$ The total number of workers in the workshop is

  • A

    $20$

  • B

    $21$

  • C

    $22$

  • D

    $23$

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