Formal:
* Comment vont les filles? (This is the most direct translation and is suitable for formal situations.)
* Comment allez-vous, mesdames? (This is a more polite way of addressing a group of girls, particularly if they are older.)
Informal:
* Comment ça va les filles? (This is a casual way to ask how girls are doing.)
* Comment allez-vous? (This is a more general way to ask how someone is doing, but it can be used for girls.)
* Ça va les filles? (This is a very informal way of asking how girls are doing.)
If you are asking about specific girls you know:
* Comment va [Name]? (This is a good way to ask about a specific girl you know.)
* Comment vont [Name] et [Name]? (This is a good way to ask about two specific girls you know.)
Remember to adjust the tone and formality based on the situation and your relationship with the people you're talking to.