the library carries a total of 750 biography, mystery, fantasy, and science fiction books. there are 3 timesas many science…

the library carries a total of 750 biography, mystery, fantasy, and science fiction books. there are 3 timesas many science fiction books as fantasy books, twice as many mystery books as fantasy books, and four times as many biographiesa as fantasy books. write an equation that describes the number of each type of book in the library.