There are three times as many books in Class A as in Class B. If Party A gives Class B 50 books, there will be as many books in each class.
In the book corner of Class A and Class B, the library of Class A is three times that of Class B. If Party A gives Class B 50 books, there are as many books in these two classes. How many books are there in each class?
b 50×2(3- 1)
= 100÷2
=50 copies
One copy is 50×3= 150 copies.