We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

With the help clues provided in the image, can you find the 5 digit key?

If 21x = 79x, what is the value of x?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

I know a nine-letter word having only one vowel.
Do you ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Remove two matchsticks to make the below equation correct.