The answer to the question is 12 stacks with four books left over. All you have to do is divide the amount of books by how much books you're putting in a stack.
So there are 64 books (lol, minecraft) 64 divided by 5= 12 remainder 4 So there are 12 complete stacks of 5.
Defend:
There are 64 books and each stack has 5 books. 64 divided by 5 equals 12 with a remainder of 4. Since each stack must have 5 books there are 12 complete stacks.
