What proportion of Jews are Leviim? What proportion are Kohanim? It would make sense that 1/13 Jews are Leviim, but that may not be true.
About how many pidyon haben ceremonies are required to be performed per 1000 Jewish births in the past few decades? The requirements for a pidyon haben are: Both parents are Israel, not Kohen or ...
In the begining of sefer bamidbar, the males between 20 and 60 are counted and it says that there are over 600,000 of them. Theoretically each, or most, of these people should have had a first-born ...
I once heard that if Israel has the largest Jewish population, it has a significant effect on certain Halachot. What are the criteria for this, and what halachot are affected? (Shmita is the one most ...