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

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

Can you decipher the two rows to find the hidden word?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I