Building Puzzle

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




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A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

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Only one color, but not one size,
Stuck at the bottom, yet easily flies.
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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.