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

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

How many children does Mr. Smith have?

Question: When is 99 more than 100?

Question: In a house of Kardak's family each brother have a sisters as double as their brothers and each sister have brothers as same as their sister. How many brothers and sisters in Kardak's family ?

Question: What are the next two letters in the following series and why? WATNTLITFS__