"Guten Tag, wie geht es?"

Translation: Hello, how are you?

[khristinna17]

Why is "Good afternoon, how are you" not correct?

[mizinamo]

It is correct. Report it as "my translation should be accepted".

"Good day" is a bad translation here, since "good day" is usually used as a farewell in English, in my experience.

This is a Pearson sentence.