I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What does below Rebus mean ?

esgg sgeg gegs gsge

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

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?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What is the next number in this series?

4,12,84,3612....

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?