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?

What's the next in the series?

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

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

If two's company, and three's a crowd, then whats four and five ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What is always in front of you but can’t be seen?

Who is that with a neck and no head, two arms and no hands? What is it?