a school librarian ordered new books for the library. 1/3 are science 2/5 are biography and the rest of the books are fiction. What fraction of the books ordered are fiction?

The way I would do this problem would be to find a common denominator for both of the fractions.

5/15

6/15

And then we can find out how many books there are left.

5/15 + 6/15 is 11/15

11/15 books are about science and biography, the other 4/15 are fiction.

i think it would be 4/15 because science is 6/15 and fiction is 5/15

i don't need it but brainliest is appreciated