prompt: 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?
messages.content: 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?
messages.role: user
messages.content: It's a 100-foot fence, and Ben whitewashed 10 feet, so there are 100 - 10 = <<100-10=90>>90 feet left after Ben is done.
  Billy whitewashed a fifth of that, or 90 / 5 = <<90/5=18>>18 feet.
  There is now 90 - 18 = <<90-18=72>>72 feet of fence left.
  Johnny whitewashes a third of that, or 72 / 3 = <<72/3=24>>24 feet.
  That leaves 72 - 24 = <<72-24=48>>48 feet of fence left to be whitewashed.
  #### 48
messages.role: assistant