Which Burger Is Different in below image?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

Here is a Swiss Cross. You have to make two straight cuts in the figure so that it is divided into four congruent pieces. Also, you should be able to join these pieces into a square then. Can you accept this challenge?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

What Adam and Eve do not have but the rest of the people have?

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

Forwards I am heavy, backward I am not. What am I?