There are 900 books on shelves A and B, so the number of books on the first shelf will increase by five-sevenths, and the number of artists will decrease by one-third. The number of these two bookshel
There are 900 books on shelves A and B, so the number of books on the first shelf will increase by five-sevenths, and the number of artists will decrease by one-third. The number of these two bookshelves is equal to the original one.
There are X bookshelves and 900-x bookshelves.
x( 1+5/7)=(900-x)( 1-3/ 1)
12x = 600-2x。
12x+2x=600。
50x of 265438+50x=600.
50 copies X = 600× 2 1.
x=252
900-252=648 copies