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)

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?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Why do we preferably have round manhole covers and not square ones?

Can you decipher the two rows to find the hidden word?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?