The number of books that can be put on each shelf is 240/6=40, and the number of books that can be put on each floor is 40/5=8.

This problem is an application problem of division calculation, and we need to really understand its meaning. Reading carefully is the key to solving practical problems. Grasp the key words in the question, let yourself know, think, distinguish the known conditions, find out what the problem is, and then connect the read questions with life examples, turn the text information into life scenes, show the process, and practice repeatedly, and you will know what to do.