Can you find the key in the picture below?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Replace the question mark in the picture below.

What number when divided in half becomes zero?

Solve the following series:
AZ, GT, MN, __, YB

Whats the next number in the below number sequence pattern.

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

What can go up a chimney down, but can’t go down a chimney up?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?