Final answer:
Pedro puts 7 books in each of the 4 boxes to distribute his 28 books evenly.
Step-by-step explanation:
If Pedro has 28 books and he wants to put an equal number of books into each of 4 boxes, we need to divide the total number of books by the number of boxes to find out how many books are put in each box.
To do this, we perform the calculation 28 ÷ 4. When we divide 28 by 4, we get 7. Therefore, Pedro puts 7 books in each box.