Count the squares in the matchstick puzzle below?

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What has lots of eyes, but can’t see?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

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