Riddle #99

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: When is 99 more than 100?

Question: Mr. Smith has 4 daughters. Each of his daughters has a brother.

How many children does Mr. Smith have?

Question: If 4+5=24 7+2=21 9+6=63 6+7=?

Question: You have a glass of water that looks about half full. How can you tell, only using the glass of water itself, if the glass is half full or not?

The glass is a right cylinder.

Question: How can you add 8 8's to make 1000?