Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

What always comes into a house through the keyhole?

What is common among 11, 69, and 88?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

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 mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

In the image below, can you find the value of an angle(y)