Question
If Seth and Luis work together, they can complete a job in 12 days. If Seth and Luis worked together for 9 days, followed by Luis who worked alone for the next 21 days, they can finish off the job.
  1. How many days would Luis need to complete the job alone? 
  2. How many days would Seth need to complete the job alone?
4 m
(a)

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(b)

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If Seth and Luis work together, they can complete a job in 12 days. If Seth and Luis worked together for 9 days, followed by Luis who worked alone for the next 21 days, they can finish off the job.
  1. How many days would Luis need to complete the job alone? 
  2. How many days would Seth need to complete the job alone?