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

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

If eleven plus two equals one, what does nine plus five equal?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you write down eight eights so that they add up to one thousand?

The more of this there is, the less you see. What is it?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?