To whom may demai be sold or sent without the seller first separating tithes?
Halachah 1 rules that demai may be sold or sent to a Torah scholar because he will not eat it before tithing, whereas selling or sending to a common person is forbidden as it assists him in eating forbidden food.
Question 2
What is the minimum 'large measure' for dry goods that shifts the tithing obligation to the buyer?
Halachah 3 defines the large dry measure as half a se'ah. Sellers who give this amount or more are considered to be adding to the measure, and the Sages placed the separation obligation on the buyer rather than the seller.
Question 3
When a chavair and a common person divide their father's estate, which exchange is forbidden?
Halachah 6 permits dividing same-type produce between locations using bereirah, but forbids exchanging fresh for dry or one species for another (e.g., wheat for barley), since bereirah cannot apply across different commodity types — that would be considered selling demai.
Question 4
What is the status of produce entrusted to a gentile for safekeeping when the Jew reclaims it?
Halachah 15 rules that produce left with a gentile is assumed to have been exchanged for his own; it is treated as the gentile's produce. If the Jew had already made the required separations before entrusting it, nothing further is required, since a gentile's grain is exempt from the tithing obligation.
Question 5
A person finds produce on the road in a town where half the locals bring produce home and half bring it to market. What is its status?
Halachah 9 rules that when the population is split evenly between bringing produce home and bringing it to market, the produce is treated as demai — extra stringency is applied to the demai prohibition, and even a half-and-half ratio defaults to requiring tithing.