Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

How can you make number one disappear by adding something to it?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

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

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Which tank will fill first?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?