Good Riddles

Question: A man wanted to enter and exclusive club, but did not know the password to get in. He waited by the door and listened. The doorman said "Twelve" and the other man said "Six" and was let in. A second member came up and the doorman said "Six" to which the member replied "Three" and was let in. The man went up and the doorman said to him "Ten" the doorman said "Five" but was not let in. Why?

Question: We have what we did not find; what we did find we left behind.

[What do we have?]

Question: How are doughnuts and golf alike?

Question: Although I am still, in families, I run. I continue to live on in a living one. As one continues to draw breath, I will not rust. However, when one stops drawing breath, I will become mere dust. What am I?

Question: It's a question you can ask all day long and get completely different answers although these answers could be correct. What question is it?