Move four matchsticks to the below square to form three squares?

It belongs to you, but other people use it more than you do. What is it?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

What has 88 keys?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

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

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

Can you count the number of blocks in the picture below?