Riddles

Here are some riddles for you to spend your free time trying to solve.

Find the 9 gram marbles
There are ten bags containing marbles. Each bag has at least 10 marbles in it. Nine of the bags contains only marbles weighting 10 grams each. One of the bags contains only marbles weighing nine grams each. Each bag has a different number of marbles in it. All of the marbles look exactly the same. The riddle is how can you know which bag has the nine gram marbles if the only device allowed to be used is a weighing scales which you can use only once?

Number of presidents
President Clinton is our 41st president but only 40 men have held the office. Why?

Father and son
A man while looking at a photograph said, "Brothers and sisters have I none. That man's father is my father's son." Who was the person in the photograph?

Fun with dates
What happened in 1961 that will not happen again for over 4000 years?

Numbers
A man wanted to enter an exclusive club but did not know the password that was required. He waited by the door and listened. A club member knocked on the door and the doorman said, "twelve." The member replied, "six " and was let in. A second member came to the door and the doorman said, "six." The member replied, "three" and was let in. The man thought he had heard enough and walked up to the door. The doorman said ,"ten" and the man replied, "five." But he was not let in. What should have he said?

The loser wins
A sheik announced that a race would decide which of his two sons would inherit all his wealth. The sons were to ride their camels to a certain distant city. The son whose camel reached the city last would be given all the sheik's wealth. The two sons set out on the journey. After severals days of aimless wandering, they met and agreed to seek the advice of a wiseman. After listening to the wiseman's advice, the two sons rode the camels as quickly as possible to the designated city. What was it that the wiseman told the two sons? They did not agree to split the wealth, and their father's decree would be followed.

Which first?
You are in a cold house in the winter. It is dark. You have one match. There is a candle and there is a wood burning stove. Which do you light first?

Drying
What is it that gets wetter when it dries?

More thinking activities
Logic puzzles
Science experiments