# 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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