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

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

You need to arrange three 7 and mathematical symbols to form number 1?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

Can you name four days which start with the letter 'T'?

What has no start, end, or centre?

What is the riddle which can be asked all day with a different correct answer each time.