You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

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

What's the best place to go shopping in the ocean?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Which digit occurred maximum times between the number 1 and 1000?

Can you count the number of squares in the figure below?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.