Well, some mathematics problems look simple, and you try them for a year or so, and then you try them for a hundred years, and it turns out that they're extremely hard to solve. ↗
Know that each acre of fallow ought to support yearly two sheep at the least, then a hundred acres of fallow can support two hundred sheep, two hundred acres, four hundred sheep and so on. ↗
The wool of a thousand sheep in good pasture at the least ought to yield fifty marks a year, the wool of two thousand one hundred marks, and so forth, counting by thousands. ↗