Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

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?

Different lights make me strange by changing me into different sizes. What am I?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

Can you solve the below tricky visual equation?

I travel all around the world but always stay in the corner. What am I?

What Time Should the last watch show in the below figure?