Question
If Ben and David work together, they can complete a job in 10 days. If Ben and David worked together for 5 days, followed by David who worked alone for the next 15 days, they can finish off the job.
  1. How many days would David need to complete the job alone? 
  2. How many days would Ben need to complete the job alone?
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

If Ben and David work together, they can complete a job in 10 days. If Ben and David worked together for 5 days, followed by David who worked alone for the next 15 days, they can finish off the job.
  1. How many days would David need to complete the job alone? 
  2. How many days would Ben need to complete the job alone?