Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What is the next number in this series?

4,12,84,3612....

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Can you find the company name in the pictogram below?