Decode below three cipher riddles:

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

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

There is a place where if I stand up straight, I will still be considered sideways.

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Replace the question mark with the correct number below.