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The total number of digits in all the page numbers of a book.I am reading now is 1689 . How many pages does my Book have ?
Read Solution (Total 6)
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- 1*9=9digit
10-99=2*90=180digit
100-599=500*3=1500digit
total digit=9+180+1500=1689
no of pages=599
total - 13 years agoHelpfull: Yes(10) No(0)
- ans : 599
9 page has 1 digit 90 has 2 digit and rest 3 digit
so let total page be x
9*1 + 90*2 + (x-99)*3 = 1689
after solution x=599 ans - 13 years agoHelpfull: Yes(5) No(0)
- i hope it is 599............(9*1)+(90*2)+(500*3)
- 13 years agoHelpfull: Yes(4) No(1)
- 599
pages 1-9 : 9
pages 10-99: 90x2 = 180
1689-189=1500
no. of three digit numbers = 1500/3=500
so, 500+99=599 - 13 years agoHelpfull: Yes(3) No(0)
- 1*9=9digit
10-99=2*90=180digit
100-599=500*3=1500digit
total digit=9+180+1500=1689
no of pages=599
total - 13 years agoHelpfull: Yes(1) No(0)
- 9+2*89+3*x=1689
x=534 - 13 years agoHelpfull: Yes(0) No(1)
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