Hi, No difference is intended. Clive
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Doug ShermanIn this case you would use "less than" because the city residents constitue a great mass of things (mass noun).
If there was a small group of people in a room and 60% of them left, then you could say "fewer than half of the people remained" (count noun).
At least that's how I understand it. For you experts out there, please let me know if thi