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math (brainteaser)

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The pahges in jacks book are numbered from the number 1, there are 555 didgits ow many pages in Jacks book

  • math (brainteaser) -

    There are 9 digits on pp 1-9
    There are 90 digits on pp 10-99
    That's 99 digits before page 100

    The rest of the pages have 3 digits each.

    555-99 = 456
    456/3 = 152

    So there are 99 + 152 = 251 pages

  • math (brainteaser) -

    Oops - I see an error
    There are 90 2-digit numbers, making 180 digits.

    555 - 9 - 180 = 366
    So, there are 122 3-digit pages, making 221 pages in all.

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