Before Mount Everest was discovered, what was the highest mountain in the world?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

If an electric train is travelling south, then which way is the smoke going?

How can you take 2 from 5 and leave 4?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

I am white when I am dirty, and black when I am clean. What am I?

What has one letter and starts with an E?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?