What does this mathematical rebus means ?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

What Does this text mean:

important=important

Can you find the key in the picture below?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

With the help clues provided in the image, can you find the 5 digit key?

Who is that with a neck and no head, two arms and no hands? What is it?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?