For me the golden rule is 20 resources per villager per minute. This is not always accurate, and goes a bit above 30 for post imperial farmers, but it is a good golden rule for early game.
A TC produces a villager in 25 seconds. In other words, it consumes 120 food per minute. So yes it is 6 farmers per TC but if you consider rebuilding farms, perhaps some idle farmer at some point, some food for ups or age up accumulation, then 20 farmers for 3 TCs is nice... in peace times.
A TC produces a villager in 25 seconds. In other words, it consumes 120 food per minute. So yes it is 6 farmers per TC but if you consider rebuilding farms, perhaps some idle farmer at some point, some food for ups or age up accumulation, then 20 farmers for 3 TCs is nice... in peace times.