There were some books in the book corner of Class 51, but after 40 books were borrowed, there were 26 books left. How many books are there in the book corner?
五1班图书角原有一些书，借出40本后，还剩26本．图书角原有多少本书？
<gadget id="calculator">40 + 26</gadget>
<output>66</output>

<result>66</result>