Logic 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: What is the best way to stop a dog from barking in, and digging up the front yard?

Question: I can be flipped and broken but I never move. I can be closed, and opened, and sometimes removed. I am sealed by hands. What am I?

Question: If 1+9+8=1, what is 2+8+9?

Question: Five pirates are parting ways after finding a treasure of 100 pieces of gold. The pirates decide to split it based on a vote. Each pirate, from oldest to youngest, gets to propose a plan on how to split the gold.

If at least 50 percent of the other remaining pirates agree on the plan, that is how they will split the gold. If less than 50 percent of the pirates agree, the pirate who came up with the plan will be thrown overboard. Each pirate is smart, greedy, and wants to throw as many others overboard as possible without reducing the amount of gold they get.

What plan can the first (oldest) pirate propose to live and get as much gold as possible?