Distribute a batch of books to the fifth and sixth grade students according to the ratio of 4:5. It is known that the sixth grade is assigned to 120 books, and how many books are assigned to the fifth grade? 120÷5=24 This step is: divide the number of books in grade six by its proportion, and it will be expanded several times.

24×4=96 and 24 times magnification at the same time.

A: The fifth grade was assigned to 96 books.