The rhetorical device used by Twain in this excerpt is the anecdote (C.).
<u>An anecdote is defined as an entertaining narrative, usually relating biographical events</u>.
This definition fits to the text because the story is an account of events which happened to the character in the past ("One winter's night, two years ago, I...") and the narrative is comical enough to be considered for entertainement value ("I was carrying off a box of guns ... and he had got my corpse!").
The answer is 3 and 1/5 if you want it in a mixed number. if you want it in an improper fraction it would be 16/5.
hope this helps!
Both were right, method #1 is Lena’s method and method #2 is Jackson’s method, and both led to the answer 280