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

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

If,

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

Then

4 / 5 = ?

What is so fragile that saying its name breaks it?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?