If 7687 books need to be placed in boxes and each box can contain at most 9 books. How many books will be in the last unfilled box?  Choose the correct choice
A) 27 books B) 1 book C) 28 books D) 0 books E) 8 books
The number of books that can be placed in boxes of 9 books is the first number that is divisible by 9 that occurs before 7687.   In order to divide the sum in 9 parts, the amount must be divisible by 9   Divisibility rule of 9: The sum of the digits must be divisible by 9   Sum of digits of 7687 =28 and 27 is divisible by 9.   Hence, we need to remove 1 to this number for it to be divisible by 9   Correct Option:1 book
<result>B</result>
If 7687 books need to be placed in boxes and each box can contain at most 9 books. How many books will be in the last unfilled box?