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Just a minute - since at the start it was stated that a pound of feathers weighs less than a pound of nails, then surely you know the correct weights before you begin the problem? Therefore, surely the problem implicitly recognises that the error is in the measurement rather than a genuine...

Ahem. Back on page 2 I wrote:

Okay, let's try again at this problem. *Subjectively*, the pound of nails will weigh more, because it's concentrated into a smaller space? Another way of looking at it is to ask, are we just talking about feathers or nails by themselves, or are they in a container? If by themselves, then...