The school bought back a batch of new books and distributed them to the fifth and sixth grades according to the ratio of 4:5. It is known that he got 120 books in the fifth grade. How many books are t
The school bought back a batch of new books and distributed them to the fifth and sixth grades according to the ratio of 4:5. It is known that he got 120 books in the fifth grade. How many books are there in this batch?
Solution: Assign the fifth grade to 4X books and the sixth grade to 5X books.
4X= 120
X=30
5X=5×30= 150 (Ben) 120+ 150=270 (Ben)