If 102 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 from the following answers: A) 12 books B) 10 books C) 0 books D) 3 books E) 9 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 102 .   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 102 =3 and 0 is divisible by 9.   Hence, we need to remove 3 to this number for it to be divisible by 9   Correct Option:3 books
<result>D</result>
If 102 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?