Can you identify if it's a murder or a suicide ?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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?

Which alphabet letter is a question?

If 1+9+8=1, what is 2+8+9?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

You need to move three matchsticks to form three squares. Can you do it?

Count the number of lines in the image below ?

What will you call your mother's brother's brother-in-law?

what does the below rebus mean?