$A$ and $B$ can complete a piece of work in $45$ and $40$ days,respectively. They began the work together,but $A$ leaves after some days and $B$ completed the remaining work in $23$ days. After how many days did $A$ leave?

  • A
    $6$
  • B
    $8$
  • C
    $9$
  • D
    $12$

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