Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What has to be broken before you can use it?

Take one out and scratch my head, I am now black but once was red. What am I?

A blonde put eyeliner on her head. Why?

What time is it when an elephant sits on a fence?

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?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.