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

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

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Which alphabet is a part of our body?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

Which tank will fill first?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?