9 digits for 1 to 9 no. 180 digits for 10 to 99 no. 1440 digits for 100 to 579 no. so total 1629 digits for 579 pages
480 pages in the book
1-9 its 9 digits
10-99 its 180 digits
100-479 its 1440 digits
so the sum of all digits is 9+180+1440= 1629
You begin reading a book 240 pages long. If you read half of the remaining book each day, how long would it take you to finish the book?
Suppose 4 digits 2 ,4,6 and 9 are given.
You have to make a four-digit number.
In how many ways it can be done, if repetition of the numbers does not allowed?
On the first day, James read 20% of a book. On the second day, he read another 66 pages and discovered that he had read 80% of the unread pages. What is the total number pages of the book?