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Digit 6 appeared 18 times in the page numbers. What is the minimum number of pages there are in the book?

Sagot :

86 pages.
Pages:
6,16,26,36,46,56,60,61,62,63,64,65,66,67,68,69,76,86
The pages with 6 are 
6,16,26,36,46,56,60,61,62,63,64,65,66,67,68,69,76
from 1-56 there are 6 6s
from 60-69 there are 11 6s
18-6-11=1
so the last page is 76 therefore there are 76 pages