Can you make a six-letter word using the letters N, A and B ?

What does this mean?

CCCCCCC

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

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?