What number when divided in half becomes zero?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

If eleven plus two equals one, what does nine plus five equal?

If,

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

Then

4 / 5 = ?

A sundial has the fewest moving parts of any timepiece. Which has the most?

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?

What country can make you shiver?

Find the number of squares in the below picture

I’m tall when I’m young, and I’m short when I’m old. What am I?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?