The library bought back a batch of books, each shelf can hold 150 books, and 11 bookshelves were just finished. How many books were bought back in this batch of books?
图书室买回一批图书，每个书架可放150本书，放了11个书架刚好放完，这批图书一共买回多少本书？
<gadget id="calculator">150 * 11</gadget>
<output>1_650</output>

<result>1_650</result>