The westerns in the store's inventory were written by 4 different authors. Author A wrote 1/4 of the books, author B wrote 5/16
of the books, and author C wrote 3/8 of the books. What part of the inventory of westerns did author D write?
1 - 1/4 - 5/16 -3/8 = D
1 - 4/16 - 5/16 - 6/16 = D = ....................
