"I don't know what 10 companies you're thinking of, but apparently at least 6 of them are in LA"
Again, there was clearly no logic here, and this time even with language issue. My god.
First you stated that you did NOT know which 10 she was talking, then you said 6 of THEM (if we have some basic idea of English, THEM stands for those 10) were in LA. If you didn't know how that set of ten was defined, what are the elements of that set, how can you determine whether an object is a member of that set?