Chapter 16 of GoF: "The boy with food all down his front nudged the girl next to him and pointed openly at Harry's forehead."
There's at least one girl amongst the Durmstrang crowd, and I think Harry or someone would have noticed if there were no, or only one, girl.
My surmise as to why wizarding schools were co-ed when so many other institutions of education were not was, among other things, the dangers of children's uncontrolled magic. Witches are just as powerful magically as wizards, and young witches need to be trained so as not to be a danger to themselves or others - unless some cultures have found a way to "squib-ify" girls or suppress their magic, and we have not heard of any such thing so far.
no subject
There's at least one girl amongst the Durmstrang crowd, and I think Harry or someone would have noticed if there were no, or only one, girl.
My surmise as to why wizarding schools were co-ed when so many other institutions of education were not was, among other things, the dangers of children's uncontrolled magic. Witches are just as powerful magically as wizards, and young witches need to be trained so as not to be a danger to themselves or others - unless some cultures have found a way to "squib-ify" girls or suppress their magic, and we have not heard of any such thing so far.