Decode below three cipher riddles:

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

There are five people. One of them shot and killed one of the other five.
We know following clues:
1. Dan ran in the NY City Marathon yesterday with one of the innocent men.
2. Mike consider being a farmer before he moved to the city.
3. Jeff is a top notch computer consultant and wants to install Ben new computer next week.
4. The murderer had his leg amputated last month.
5. Ben met Jack for the first time six months ago.
6. Jack has been in seclusion since the crime.
7. Dan used to drink heavily.
8. Ben and Jeff built their last computers together.
9. The murderer is Jack's brother. They grew up together in Seattle.

Consider yourself to be a famous detective "Sherlock Homles", Can you find the killer?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Replace the question mark with the correct number in the below-given picture?

What has hands, but can’t clap?

By using 'because' continuously three times, can you make an English statement ?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

What's the only room from which no one can enter or leave