X-Men: Doing work
Algebra
Level
1
If 'p' X-men can do a job in 'd' days, then '(p + r)' X-men can do the job in:
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1 solution
If 'p' X-men require 'd' days to do the job, then 1 X-man requires 'd*p=dp' days to do the job. Therefore, '(p+r)' X-men need '(dp)/(p+r)' days to do the job.