why number 8549176320 is one of a kind?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

What is Luis Suarez's (Soccer Player) favorite tea?

Solve the following series:
AZ, GT, MN, __, YB

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C