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

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

What is harder to catch the faster you run?

If 21x = 79x, what is the value of x?

Who are the happiest people in IPL match?

Can you write down eight eights so that they add up to one thousand?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Can you find the six hidden animals in the picture below?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

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