A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?

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

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Can you place three balls such that the equation shown in the picture holds true?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you solve the photo plexer logic ?