Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

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

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Why are all black people so quick ?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

Can you name some countries which do not have the alphabet 'A' in them?

A bomb exploded in a room full of married couples and no one died. How?

Can you find a five letter word that is left with only two letters if one is removed?