Distribute a batch of books to the second, third and fourth grades according to the ratio of 4 to 5 to 6. It is known that the second grade has 48 fewer books than the fourth grade. How many books should each of the three grades have? Distribute a batch of books to the second, third and fourth grades according to the ratio of 4 to 5 to 6. It is known that grade two gets 48 fewer books than grade four, and how many books does grade three get?

Solution: According to the meaning of the question, the formula is:

4:5:6= two: three: four.

4:6=(X-48):X

4X=6(X-48)

4X=6X-288

2X=288。

X= 144。 (fourth grade book)

Second grade books:

144-48=96.

Third grade books:

4:5=96: 3

Three =96x5/4

= 120 copies.

A: There are 96 books in Grade Two, 0/20 books in Grade Three and 0/44 books in Grade Four.