There are 14 boxes of story books and 36 boxes of science books, and each box contains 20 books. How many books are there?
有14箱故事书和36箱科技书，每箱装的书都是20本．一共有多少本书？
<gadget id="calculator">14 + 36</gadget>
<output>50</output>

<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<result>1_000</result>