This is a example of satire. The author is making the reader laugh but he is also pointing out/criticizing how people in society get taken advantage of without realizing it, Tom is taking advantage of Ben and getting him to do his work for him.
Tom's has to whitewash a fence. Tom is disappointed because he had so many fun things planned for today. Tom wants to find a way out of whitewashing. Tom comes up with a plan.
Tom artistically paints the fence when Ben walks by he is interested. Tom persuades Ben to whitewash in exchange for his apple.
"No-no-I reckon it wouldn't hardly do, Ben... I reckon there ain't one boy in a thousand, maybe two thousand, that could whitewash this fence"(Twain 21).
" Say, Tom, let me whitewash a little"(Twain 21).
"-I'll give you the core of my apple... I'll give you all of it!"(Twain 21).
As Tom sits and eats his apple more boys come after Ben and try to whitewashing the fence. Each boy trades one of his things to try and whitewash. Soon the fence is completely done being whitewashed and Tom has done little to no work.