A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

In the image given, you can find several triangles. Can you count them all?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

What has one eye, but can’t see?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

What is so fragile that saying its name breaks it?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Why are televisions attracted to people?

Can you name an animal whose killing cannot be performed without spilling your own blood?