The school lends books to 45 classes, with an average of 136 books per class, and there are 880 books left. How many books are there in the school?
学校将图书借给45个班，平均每班借136本，还剩下880本，学校共有图书多少本？
<gadget id="calculator">136 * 45</gadget>
<output>6_120</output>

<gadget id="calculator">6_120 + 880</gadget>
<output>7_000</output>

<result>7_000</result>