In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

What is black when you buy it, red when you use it, and gray when you throw it away?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

Count the number of triangles in the given picture.

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

What is the longest word in the dictionary?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?