Math Riddles

Question: How many people do you need to have the odds be in favor (at least 50% chance) of two people having the same birthday?

Question: If you toss a coin ten times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Question: A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

Question: When is 99 more than 100?

Question: There are five hen and rooster pairs. Each pair has one baby every month.

How many chickens will there be in one year?