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Join Date: Dec 2011
Thanked 243 Times in 87 Posts
A total of 642 digits was used in numbering the pages of a book. How many pages did the book contain?
Join Date: May 2011
Thanked 505 Times in 128 Posts
This one is easy but funny. =)
So, first we suppose that all the pages are numbered.
1-9 page its 9 digits
10-99 page its 180 digits (99-9=90 ; 90*2=180)
We stop here. We already have 9+180 digits = 189 . We need 642-189=453 ;
453/3 = 151
Result: 250 pages.
You need only 2 objectives in life:
when you look at the past and you say that you coudn't have done any better than that is the 1º one.
The 2º one is to do better than that
Then, you must learn 2 rules in your life:
Rule number one : respect yourself and the others
Rule number two: first learn rule number one
Join Date: Jan 2012
Thanked 2 Times in 1 Post
250 pages. Thanks for creating this challenge question here at http://www.xpmath.com