What does this rebus puzzle means ?

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?

Next Number in the Series,

5, 16, 49, 104, ?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

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

Why did the Girl throw the butter out of the window?

Solve the counting riddle by identifying the number of triangles in the given picture.