What has lots of eyes, but can’t see?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Why 1729 is a magic number? Answer Logically.

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

I travel all around the world but always stay in the corner. What am I?

You see me once in June, twice in November, and not at all in May. What am I?

In the image given, you can find several triangles. Can you count them all?

Can you count the number of blocks in the picture below?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?