How can a man go eight days without sleep?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

Can you find the key in the picture below?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Why did the Girl throw the butter out of the window?

I know a nine-letter word having only one vowel.
Do you ?

How many letters are in the alphabet?