10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Can you count the number of quadrilaterals in the picture below?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

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

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

I am an odd number. Take away a letter and I become even. What number am I?

What is so fragile that saying its name breaks it?

Find the 8 in the below-given Image.

In the image below, can you find the value of an angle(y)