There were 228 story books and 165 science books in the library, and 89 of these two books were purchased later. How many more story books than science books?
图书室里原有故事书228本，科技书165本，后来又购进这两种书各89本，这时故事书比科技书多几本？
<gadget id="calculator">228 - 165</gadget>
<output>63</output>

<result>63</result>