The books of Kunshan Experimental Middle School will be lent to 24 classes, with an average of 125 books per class, and there are still 780 books left. How many books does the school have in total?
昆山实验中学的图书将借给24个班，平均每班借125本，结果还剩下780本．学校共有图书多少本？
<gadget id="calculator">24 * 125</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 + 780</gadget>
<output>3_780</output>

<result>3_780</result>