There are 24 bookshelves in the library of the experimental primary school, with an average of 500 books on each shelf. Now 150 books have been lent out, how many books are left in the library?
实验小学图书馆共有24个书架，平均每个书架上放500本书．现在已借出150本，图书馆还剩多少本？
<gadget id="calculator">50 * 24</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 - 150</gadget>
<output>1_050</output>

<result>1_050</result>