You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

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)

Count the number of balls in picture below:

In the image given, you can find several triangles. Can you count them all?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What always comes into a house through the keyhole?