The school library distributed a batch of new story books to 18 classes, with 45 books in each class, and there were 420 books left. How many new storybooks are there in the school library?
学校图书室把一批新故事书分给18个班级，每班45本，还剩420本．学校图书室这批新故事书共有多少本？
<gadget id="calculator">990 + 240</gadget>
<output>1_230</output>

<result>1_230</result>