During which month do people sleep the least?

I have Rs.50 and I spend it in the way as below.

Can you place six X (crosses) in below board without making three in a row in any way ?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

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

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

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

Complete the table series riddle by finding the number that can replace "??".

how come the second man dies?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.