Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the word or phrase?

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?

They are three errirs in this question. Can you find them?

What work can one never finish?

I travel all around the world but always stay in the corner. What am I?

Through your logical capabilities, can you make 7 an even?

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".