Using Only Five 5's and any mathematical operator make sum as 37

what does the below rebus means?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Can you name an animal whose killing cannot be performed without spilling your own blood?

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

In the given picture, in how many ways can you read the word "Tiger"?

If your uncle’s sister is not your aunt, what relation is she to you?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?