Two people working together can clean a pig pen in 4 hours. Working alone, it takes Thurman Mervin 3 hours longer to clear the pen than it would take Bobbi Sue. How long would it take
Thurman Mervin to clean the mink farm alone? (Round answer to the nearest tenth.)
I don’t know where to start

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655