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?

In the four images below, can you find the odd one out?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

What breaks yet never falls, and what falls yet never breaks?

It is always ahead of me yet I can never see it. What is it?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?