Please advise which is correct

Question

Which is correct? "Buenos tardes" or "Buenas tardes"

Answer 1

buenas tardes, this is the correct form

Answer 2

Buenas tardes. Tardes is feminine.

Answer 3

1. -Buenas tardes. La tarde. -Buenas noches. La noche.

   These two use 'buenas' because 'tardes' and 'noches' are feminine.

2. Buenos días. El día

   This one is the only one that uses 'buenos' because 'días' is masculine.