Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

What is black when you buy it, red when you use it, and gray when you throw it away?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

In the given picture, in how many ways can you read the word "Tiger"?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?