"These ladies are model employees."
Translation:Ces dames sont des employées modèles.
According to this: https://www.thoughtco.com/cettes-filles-french-mistake-1369451 , simply because French is not logical (well neither is English). 'Ces' is the plural for both M & F. Not very comforting but there is is.
I would have thought that the 'g' of 'bangs' (goodness) would justify placing 'modèles' before 'employées'. I did this but was rebuked by Duo...