Good Riddles

Question: You want to go to a club but to get in you must respond correctly to what the bouncer says. The bouncer says 12 to one man and the man responds 6, he is allowed in. The bouncer says 6 to another man and the man says 3, he too is allowed in. A third man walks up and the bouncer says 10 and the man responds 5, but he is denied entry.

What number should he have said to get in?

Question: How can you flip the shape upside down by moving only two of the sticks?

Question: I have lakes with no fish.
I have roads with no cars.

What am I?

Question: A man leaves his house in the morning and kisses his wife. On his way home from work he sees that somebody has hit a power line. He immediately knows his wife has died.

How did he know this?

Question: Thirty men and only two women, but they hold the most power.
Dressed in black and white, they could fight for hours.

Who are they?