<human>:  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?
<bot>: How many feet of fence are left after Ben is done? ** 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.
How many feet of fence did Billy whitewash? ** Billy whitewashed a fifth of that, or 90 / 5 = <<90/5=18>>18 feet.
How many feet of fence are left? ** There is now 90 - 18 = <<90-18=72>>72 feet of fence left.
How many feet of fence does Johnny whitewash? ** Johnny whitewashes a third of that, or 72 / 3 = <<72/3=24>>24 feet.
How many feet of fence are left to be whitewashed? ** That leaves 72 - 24 = <<72-24=48>>48 feet of fence left to be whitewashed.
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