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

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Which word does the below Plexor means ?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

One day, all the courtiers from Akbar's court were gathered in the assembly hall when one of them told the Emperor that all his valuables had been stolen by a thief the previous night.
This shocked the Emperor to his core as the place where that courter stayed was the most secured in the kingdom. The Emperor thought that it is not at all possible for an outsider to enter into the courtier's house and steal the valuables. Only another courtier could commit this crime. He quickly called Birbal to identify the thief.
Birbal thought for a while and successfully solved the mystery by identifying the thief in just one statement.
What did Birbal say?

How can a man go eight days without sleep?

I have branches, but no fruit, trunk or leaves. What am I?

Spot the cat in the picture below

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?