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?

I have branches, but no fruit, trunk or leaves. What am I?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What Deficiency does the below rebus represent?

VIT_MIN

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

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

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?