Five workers have been hired to complete a job. If one additional worker is hired, they could complete the job $4$ days earlier. If the job needs to be completed $20$ days earlier, how many additional workers should be hired?
According to the info given, Each additional worker hired reduces the time by 4 days
We just have 4x=20 where x is the number of workers needed.
This means we have x = 5, so we need 5 additional workers!
Thanks! :)