Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Tom Sawyer has tricked his friends into whitewashing Aunt Polly's 100-foot fence. His first friend, Ben, whitewashed 10 feet. His second friend Billy whitewashed a fifth of the remaining fence. A third friend, Johnny, whitewashed a third of the fence that was left after that. How much of the fence still needs to be whitewashed?

### Response:
 Rafiki wa kwanza, Ben, alichora rangi futi 10 za uzio.
Rafiki wa pili, Billy, alichora rangi sehemu ya tano ya uzio, ambayo ni futi 100/5 = 20.
Rafiki wa tatu, Johnny, alichora rangi sehemu ya tatu ya uzio, ambayo ni futi 100/3 = 33.
Jumla ya uzio uliochorwa rangi ni futi 10+20+33 = <<10+20+33=63>>63.
Uzio ambao bado unahitaji kuchorwa rangi ni futi 100-63 = <<100-63=37>>37.