+0  
 
0
31
1
avatar

Over the course of numbering every pages in a book, a typist types 2,929 individual digits.

Can you figure out the number of pages on the book?

 Aug 13, 2020
 #1
avatar
0

There are 189 digits from 1 to 99 inclusive = 189

There are 3 x 900 =2700 digits from 100 to 999 =2,700

[2929 - (189 + 2700) = 40 digits between 1000 up to the number we are looking for.

40 / 4 =10. We need 10 numbers of 4 digits each between 1000 and 1009.

So, 1009 is the number of pages in the book.

 Aug 13, 2020

62 Online Users

avatar
avatar