$A$ and $B$ can together finish a work in $30$ days. They worked at it for $20$ days and then $B$ left. The remaining work was done by $A$ alone in $20$ more days. $A$ alone can finish the work in (in days):

  • A
    $48$
  • B
    $50$
  • C
    $60$
  • D
    $54$

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