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

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

In which direction should the missing arrow point?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

What Adam and Eve do not have but the rest of the people have?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?