odds of opponent holding pocket Aces given you holdpocket Kings

I saw this question on a WPT broadcast.

(In hold em)

In a 6-handed game what are the odds of an opponent holding pocket Aces given you have pocket kings? I Think they said the answer was about 44 to 1.

Could someone explain how to figure the odds. I've tried it several ways I thought were correct but have come up with answers between 33 to 1 and 40 to 1 and have concluded I don't know how to solve this problem and/or I don't remember the answer given on the broadcast.