Building Puzzle

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




Similar Riddles

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

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Can you tell if the bridge breaks at this point or not?

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If 2 workers can complete painting 2 walls in exactly 2 hours.

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Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

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This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Brick Optical Illusion

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1. What does:
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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.