"Est-ce que vous ajoutez du sel ?"
Translation:Do you add some salt?
This answer is requiring the word "some" be included; that has not been required in other cases.
"Do you add salt?" (without "some")
and it was marked correct as of Sep 11th 2018.
It should. Next time you come across this exercise translate it that way. But it would be easier and faster to use a translator and double check ;-)