Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

A man plots the murder of his wife. His plan is full proof. Nobody saw them leaving their house. He stabbed her with a knife while driving. She died on the spot. He threw her body in a valley. He threw the knife carefully wiping his finger prints on a random garbage bin. Then he went back to his home and no one was watching him this time as well.

After an hour, he was called by the local police department who informed him that his wife was murdered. They asked him to reach the scene of crime immediately. But as soon as he arrived at the crime scene, he was arrested by them.

How did the police know that he himself is the murderer?

I look at you, you look at me, I raise my right, you raise your left. What am I?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Count the number of squares in the picture below.

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?