My dd's gifted class has about 7 girls and 15 boys. But I'm happy with that because last year only 3 of 16 were girls. This year, the GT office admitted to changing criteria to get more girls, and they also drew some from a nearby district.

My dd didn't have a great experience with so few girls last year, so I doubt I would have insisted she stay in that class if the ratio hadn't been changed. I suppose I would have looked at other schools or homeschooling. On the other hand, this is apparently an issue in our area-- the school itself is 2/3 boys, which does create an interesting dynamic all around.