The school has 674 science and technology books, 250 literature and art books, and 390 cartoon books. Now these books are divided into 18 classes on average. How many books are divided into each class?
学校有科技书674本，文艺书250本，卡通书390本，现在把这些书平均分给18个班，每班分到几本？
<gadget id="calculator">674 + 250 + 390</gadget>
<output>1_314</output>

<gadget id="calculator">1_314 / 18</gadget>
<output>73</output>

<result>73</result>