Quantitative Aptitude :: Number System Problems And Answers

63. Find the number of digits that are to be used in numbering a book of 400 pages.

A. 1094 B. 1093
C. 1092 D. 1099
Answer & Explanation

Answer: Option C

Explanation:
One digit numbers from 1 to 9 = 9
Two digit numbers from 10 to 99 = 90
Three digit numbers from 100 to 400 = 301
.:Total numbers of digits that are to be used
=(9 x 1) + (90 x 2) + (301 x 3) = (9 + 180 + 903) = 1092
 


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