Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Find the missing number in the sequence below:

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

What can you serve, but never eat?

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain