How many reports does it take to remove a question?

No one knows precisely, but one report removes NOTHING. 

sometimes it takes 4 or 5....and sometimes 10 or more doesn't get something to drop.  

There doesn't seem to be any rhyme or reason to it. 

From what I know, it has to take two or more trusted users' reports for a question to be deleted from this site. A single report also has the same effect.

The exact answer is not known- but I would guess about 10. Because it does seem to take awhile for even the most horrendous questions to drop.

How is anyone supposed to know?

Because, you don't know how many other people have reported the same thing... it could be 4, 7, 12, 25, 42 times.

But according to LAN, I am every user on Yahoo Answers, yet I don't report anything, so explain that one for us LAN! Eh?

For a serial abuser like you, not that many.

No one really knows. Often one report is not enough. 

Yahoo is Community Moderated so it Depends on who Reports it and if they are a Trusted Reporter or not 

If they are a Trusted Reporter that is Reporting it it can be as Little as 1 Report 

Or if they are not a Trusted Reporter it could be at Least a Few Reports or more