SOLUTION: mona bought an ecxercise book.she numbered the pages.if the digits used were 151, how many pages are there in the exercise book?

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Question 841521: mona bought an ecxercise book.she numbered the pages.if the digits used were 151, how many pages are there in the exercise book?
Answer by Alan3354(69443) About Me  (Show Source):
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mona bought an ecxercise book.she numbered the pages.if the digits used were 151, how many pages are there in the exercise book?
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1 thru 9 is 9 digits.
151 - 9 = 142 digits
The numbers 10 to 99 are 2 digits each.
142/2 = 71 numbers
10 to 70 is 71 numbers
--> 70 pages