I wrote: The girls' locker room is clean. I was told I had a type, which I did not. Plural possessive has an apostrophe after the plural s. This type of sentence has been marked incorrect in several places. This error should be remedied.
I believe it should be "girl's locker room" because it is for the female gender (girls), not a specific group of girls. (In which case, it would be girls' locker room.)
No, I was always taught possessive singular puts the apostrophe before the 's', whereas plural possessive places the apostrophe after the 's'.
I agree with you, and rereading my reply above, I have no idea what I was talking about when I wrote that.
It still does accept girls' locker rooms. "locker room of the girls" sounds really awkward in english. English speakers generally do not form most possessive's this way.