If m men can do a job in d days, then m\plus{}r men can do the job in:<spanclass=′latex−bold′>(A)</span>d+r days<spanclass=′latex−bold′>(B)</span>d−r days<spanclass=′latex−bold′>(C)</span>m+rmd days<spanclass=′latex−bold′>(D)</span>m+rd days<spanclass=′latex−bold′>(E)</span>None of these