You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Why is the longest human nose just 11 inches?

If your uncle’s sister is not your aunt, what relation is she to you?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Can you identify if it's a murder or a suicide ?

Remove two matchsticks to make the below equation correct.

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?