People put me on the table and cut me but do not eat me. What am I?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

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.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Can you write down eight eights so that they add up to one thousand?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?