Math Riddles

Question: A man wanted to enter and exclusive club, but did not know the password to get in. He waited by the door and listened. The doorman said "Twelve" and the other man said "Six" and was let in. A second member came up and the doorman said "Six" to which the member replied "Three" and was let in. The man went up and the doorman said to him "Ten" the doorman said "Five" but was not let in. Why?

Question: 1 11 21 1211 111221 312211 13112221 1113213211 what comes next?

Question: sedentary stop + sudden start = ?

Question: There are three men and a judge. The judge has 5 hats. Three of them are red and two of them are white. The judge says "Close your eyes, I am going to place a hat on each of your heads, who ever can guess what color hat they are wearing can go free." Facts: 1. The three men are standing in a line facing the judge. Where person three can see person two, one and the judge. Person two can see person one and the judge, person one can see the judge. Person three opens his eyes first, then person two, then person one goes last. 2. Each person can hear the others response. 3. The additional 2 hats are not visible 4. Person one guesses correctly. Question: What color hat is person one wearing and how do you know?

Question: A bat and a baseball together cost $1.10. The bat costs a dollar more than the ball. How much does the baseball cost?