Club Security - Interview Questions

2
Hello friends
now i text one interview question. Please give answer. Because i don't know it's answer.

My faculty asks this question.

-->you are standing outside of party club.you want to go inside.but if you tell password to security,he will allow. Otherwise you can't enter. You don't know password. Someone came.he knows password.that person stands infront of security. Security told "12" that person replied"6".
security allowed him. Then next person came.he stands infront of security. Security told "6". That person replied"3".
Finally he thinks(i found that secret). And he stands infront of security. And security asks "10" and he reply "5". But he not allow to enter club.Because password is wrong.

Why?
If you know , please give me that solution
if you don't know , please fine for me
otherwise i will give answer on monday because she(my faculty) will give answer on monday
thanks for reading.
Kumaravel, proud to be a member of Vidyarthiplus.com (V+) - Online Students Community since Feb 2013.Treeswing
Answer is 3...

For 12 - twelve

No of character : 6


For 6 - Six

No. of character : 3


Similarly,

For 10 - Ten

No. of Character : 3
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    Club Security - Interview Questions