How do you say 3 20 in french?

There's no direct translation of "3 20" in French, as it depends on the context. Here are some possibilities:

If you are referring to a time:

* 3h20: This would be the most common way to say "3:20" (3 hours and 20 minutes).

* Trois heures vingt: This is a more formal way to say "3:20".

If you are referring to a number:

* Trois vingt: This means "three twenty," but it's not commonly used for a specific number.

* Trois virgule vingt: This means "three point twenty," and would be used for a decimal number.

If you are referring to a quantity:

* Trois vingt: This could mean "three twenties," and would refer to a quantity of 60.

To be more specific, please provide the context.