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?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Can you find the thief by just looking at the picture below?

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

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What does this rebus riddle means ?

Using Only Five 5's and any mathematical operator make sum as 37

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.