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

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(b)

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