### Brain Teasers

# Number 9

I am compiling a world almanac, and it now contains lots of pages. I know that it takes 121 digits to print the page numbers in sequence. How many numbered pages does the book have, and how many times does the number 9 appear?

### Answer

There are 65 pages and the number 9 appears 6 times.9+56*2=121

9 appears in 9, 19, 29, 39, 49 and 59.

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