Standard number of farmers for unit production?

[Alexander]

Many people are aware of guidelines like having 7 villagers gathering gold for 2 range archers or having 10 villagers gathering wood for feudal age rushes. Stuff like that. I was curious if there are any guidelines for farmers and food units as well. What is the required number of farms to generate kts from 3 stables? What is the ratio of farms to stables scouts in the feudal age?

Naturally, a wheelbarrow will decrease the number of farms required. Do you have any thoughts?