Which country gets ill every time?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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

There are 3 apples in the basket and you take away 2. How many apples do you have now?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Remove two matchsticks to make the below equation correct.