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?

Which number comes next in the number series?

2, 9, 30, 93, ?

What makes this number unique: 8,549,176,320?

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?

Can you make a six-letter word using the letters N, A and B ?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Count the number of lines in the image below ?

How many triangles are there on the puzzle below?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?