Hi, I would not touch this with a 20-foot pole or with a 20-feet pole, which of those two is correct. I know that 20 feet is the length of the pole The traditional expression is I would not touch this with a 10 -foot pole. Say 'foot' rather than 'feet' when the term is used adjectivally.
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Which is correct. We have one hundred foot of warehouse space or we have one hundred feet of warehouse space.