From: littleredhairedgirl@gmail.com   
      
   Programming Robots   
      
      
   There are several tasks that require a group of specially programmed   
   robots.   
      
      
   The tasks can be named tO, tM, tC and tI. Each task takes one full   
   day   
   to perform.   
   Task tI is and idle function. Each robot must be idle twice,   
   consecutively to be maintained and reprogrammed for a new schedule of   
   tasks.   
   Task tO is an operational function. Each Robot is programmed to place   
   widgets into packaging. This operation must performed by one Robot   
   every day. It is preferable that the Robot be programmed to perform   
   this function consecutively, or at the beginning and end of a   
   programmed cycle.   
   TasktM is a maintainance function. Each Robot is programmed to work   
   on   
   repairing any broken equipment. The function may be performed   
   Wednesday through Saturday. All Robots must perform this task on   
   Sunday, unless they are idle (Task tI).   
   Task tC is a cleaning function.  Each Robot is programmed to clean   
   the   
   entire work space. This operation must performed by one Robot every   
   day. It is preferable that the Robot be programmed to perform this   
   function consecutively, or at the beginning and end of a programmed   
   cycle. This Task must be repeated by an additional Robot on Friday   
   and   
   Saturday.   
      
      
   These robots function daily, seven days a week.   
   Each Robot may only be programmed to perform tO twice each week.   
   Each Robot may only be programmed to perform tC twice each week.   
   Each Robot may be programmed to perform tM any time during the  week.   
      
      
   Tasks tI, tC, tO should be performed consecutively.   
      
      
   How many Robots are required to complete these scheduled tasks?   
   Can this schedule be expressed in Excel with a sheet looking like   
   this...   
      
      
                     Mon   Tue   Wed   Thu   Fri   Sat   Sun   
   Robot1        tO      tO    tI       tI        tC    tC      tI   
   Robot2        tI        tI      tC     tC      tO    tO     tM   
   Robot3        tC      tC     tO     tO      tI      tI      tM   
      
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