There are 30 bookshelves for children’s science fiction in the electronic reading room of a certain school, each with 24 books, and 70 bookshelves for children’s popular science books, each with 24 books. How many books are there in total?
某校电子阅览室的少儿科幻小说有30个书架，每个书架有24本书，少儿科普书有70个书架，每个书架有24本．两种书共有多少本？
<gadget id="calculator">24 * 30</gadget>
<output>720</output>

<gadget id="calculator">24 * 70</gadget>
<output>1_680</output>

<gadget id="calculator">720 + 1_680</gadget>
<output>2_400</output>

<result>2_400</result>