Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Give it food and it will live; give it water and it will die.

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?