40÷8=5 Everyone can get 5 word books.

5+8= 13, and each person gave 13 copies.

Comprehensive formula: 64÷8+40÷8= 13.

Another algorithm:

There are many new books: 64+40= 104.

How many copies can each person get: 104÷8= 13.

Comprehensive formula: (64+40)÷8= 13.