Riddle 6

[tuxkamen]

Sixth Team Immunity Challenge

You see before you a sign, on it is the following

There is a secret club.
A club member said “30” from behind the door. A person answered “6” and was let in.
A club member said “45” from behind the door. A person answered “9” and was let in.
A club member said “60” from behind the door. A person answered “12” and was turned away. What should he have said?


Answer: Five.

Already submitted. I'll let you guys figure it out.

[fembot]

Are you sure you don't want to tell us, so that we can pick it apart on the remote chance you're wrong? >_>

[tuxkamen]

Hint: Spelling.

[tuxkamen]

If you really want to fact-check (I am positive this is the answer having heard this before, though:)

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The password is the number of letters in the number given.
30 = thirty = 6, 45 = fortyfive = 9, 60 = sixty = 5.

[fembot]

fucking hell that's so simple
(easy to say now, eh?)

I was looking for some advanced math or some thing