Riddle: The Club

A friend of mine linked to a blog with a riddle, which I never solved, but had to look in the comments for the answer. It’s wonderful, try to solve it. :)

There’s a club. Anyone can join the club.
If they can answer the doormans question.
A man who wants to join stands near the door and listens to the doorman.
A member walks up to the doorman and the doorman says,
”Twelve.”
The member replies, ”Six.”
The doorman lets him in.
Another member walks up to the doorman. The doorman says,
”Six.”
The member replies, ”Three.”
Feeling confident, theman wanting to join walks up to the doorman.
The doorman says, ”Ten.”
The non-member replies, ”Five.”
The doorman tells him to leave.
Why?

– Aki

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