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Olegator [25]
3 years ago
10

How do you do number 25? At the bottom.

Mathematics
1 answer:
Ivanshal [37]3 years ago
3 0

<u>Answer-</u>

<em>The printer used </em><em>642 digits</em><em> to print all the pages in the book.</em>

<u>Solution-</u>

There are 250 pages numbered starting from 1 to 250.

The total number of digits would be the sum of digits of all single digits from 1 to 9, all double digits number from 10 to 99, and all triple digits number from 100 to 250.

There are 9 single digit numbers from 0 to 9, 90 double digit numbers from 10 to 99, and 151 triple digit numbers from 100 to 250.

So,

\text{Total digits}=(1\times 9)+(2\times 90)+(3\times 151)\\\\=9+180+453\\\\=642

Therefore, the printer used 642 digits to print all the pages in the book.

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you can create this proportion:

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cross-multiply:

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