Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

How do you go from 98 to 720 using just one letter?

How far can you walk into the woods?

What has to be broken before you can use it?

What does Alexander the Great and Winnie the Pooh have in common?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

What is the fastest way to double your money?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

If it took eight men ten hours to build a wall, how long would it take four men to build it?