Word Problem 1-54 (Static) [LU 1-2 (1)] As of mid-September 2021, 229,552,716 worldwide cases of coronavirus were reported by www.worldometers.info. It was also reported 206,248,522 have recovered and 4,709,175 have died. How many cases are unaccounted for to date?  Also discuss some ways or advise what are the steps taken to handle such situations in future.