A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

A man dies of old age on his 25 birthday. How is this possible?

What word does this rebus represent?

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Can you calculate the probability of getting a sum of six when a dice is thrown twice?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

When it's bad luck to meet a black cat?

How can you tell a raw egg from a hard-boiled egg?