* "Bien, ¿cómo estás?" - This is the correct way to say "How are you?" in Spanish.
* "Como andas" - This is a less formal way to say "How are you doing?" in Spanish, similar to "How's it going?" in English.
So, depending on the context, the person might be trying to say:
* "How are you?" - "Bien, ¿cómo estás?"
* "How are you doing?" - "Como andas"
It's important to use the correct grammar when speaking Spanish. The speaker might be learning the language and making a mistake.