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

Why do we preferably have round manhole covers and not square ones?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

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

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?