What is wrong in the below Picture?

Name a key which is hardest to turn.

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

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

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?