What do you get if you add 2 to 100 four times?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

It is always ahead of me yet I can never see it. What is it?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

Take one out and scratch my head, I am now black but once was red. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?