I have eight fingers and two thumbs but I do not live. What Am I?

Count the number of triangles in the given picture.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

What occurs twice in a week, once in a year but never in a day?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Can you find the 09 errors in the picture below?

What is the next number in the series?

15 29 56 108 208 ?

A man is found unconscious in front of a store at two in the morning. His head is bleeding and there’s a brick laying next to him. When the police arrive, they carry the man to jail. Why did they arrest him?