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?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Can you spot the hidden girl in the picture below?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

What is more useful when it is broken?

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

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

My location can be determined by the below rebus.
So where am i ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?