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)

Move four matchsticks to the below square to form three squares?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Can you start the fire using two pieces of wood?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Solve the mathematical equation in the picture below.

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

How many letters are in the alphabet?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?