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

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Solve the puzzle by telling what does below picture means.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?