There is an earlier question, The grazing cows of Sir Isaac Newton, which says:
Sir Isaac Newton's book "Arithmetica Universalis" contains the following famous puzzle:
In $4$ weeks, $12$ cows graze bare $3\frac13$ acres of pasture land, and in $9$ weeks, $21$ cows graze bare $10$ acres of pasture land. Accounting for the uniform growth rate of grass and assuming equal quantities of grass per acre when the pastures are put into use, how many cows will it take to graze bare $24$ acres of pasture land in a period of $18$ weeks?
Nowadays, some routine knowledge of highschool algebra suffices to find the answer to Sir Isaac's puzzle: It will take $36$ cows.
I would like to ask a further question about dynamic equilibrium. Given this setup, what is the minimum area required to sustain 10 cows for infinite time?