How can a man go eight days without sleep?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

Count the number of triangles in the given picture.

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

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?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What is so fragile that saying its name breaks it?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _