15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What is the centre of gravity?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

John was piloting a plane behind a car but was never able to overtake it. Why?

What does an Island and the letter T have in common?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?