Question
If David and Ben work together, they can complete a job in 12 days. If David and Ben worked together for 8 days, followed by Ben who worked alone for the next 20 days, they can finish off the job.
  1. How many days would Ben need to complete the job alone? 
  2. How many days would David need to complete the job alone?
4 m
(a)

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(b)

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If David and Ben work together, they can complete a job in 12 days. If David and Ben worked together for 8 days, followed by Ben who worked alone for the next 20 days, they can finish off the job.
  1. How many days would Ben need to complete the job alone? 
  2. How many days would David need to complete the job alone?