Total number of albums: 2 9×6=5 2 5 (copies),

3.5 Class Donation Number * * *: 5 25-(She 9+ 2 5+ She l+ She 5)

=5 Liang 5-329,

=l55 (Ben),

Because 6 Liang +2 she =l55,

So the number of books in class 3 is 6 and 2; The number of books in Class Five is two.