There are some story books in the library. There are 24 more science books than story books, and fewer comics than stories 16. How many more science books than comics?
Suppose there are 50 story books, then there are 50+24 = 74 science books, 50- 16 = 34 comics, and 74-34 = 40 science books are more than comics. You can set the number of storybooks to other numbers, and finally you will find that the calculation process is actually 24+ 16 = 40.