What happened when the wheel was invented?

If eleven plus two equals one, what does nine plus five equal?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What does a man do only once in his lifetime, but women do once a year after they are 29?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

They are three errirs in this question. Can you find them?

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

With the help clues provided in the image, can you find the 5 digit key?

Can you find out the number of the parking space in which the car is parked?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?