Question

Q.3) A book has 250 pages. How many digits have
been used to print the page numbers of
the book?
A) 637
B) 642
C) 750
D) 641​

Answer 1

Answer:

642 or B

Step-by-step explanation:

3 times 151  = 453

90 times 2 = 180

9 times 1 = 9

453 plus 180 plus 9 = 642

Answer 2

Given : A book has 250 pages.

To find : How many digits have  been used to print the page numbers of

the book

Solution:

pages 1 to 9    single digits

pages 9

hence total digits = 9 * 1 = 9

pages  10 to  99   two digits

pages 90

hence total digits = 90 * 2 = 180

pages  100 to  250   three digits

pages 151

hence total digits = 151 * 3 = 453

Total Digits = 9 + 180 + 453

=  642

Total digits have  been used to print the page numbers of  the book = 642

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