A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Count the number of balls in picture below:

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

Look at the picture and find out which square is not linked with any of the other squares.

What is both possible and impossible at the same time?

What is the next number in this series?

4,12,84,3612....

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

Can you count the number of quadrilaterals in the picture below?