Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What is the word or phrase?

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

How many times can you subtract the number 5 from 25?

How can you make number one disappear by adding something to it?

How many words can a pen with half refill write?

How many letters are in the alphabet?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?