The fourth grade of Mingguang Primary School held a "Reading Festival", and each class borrowed books from the school library. Among them, each class borrowed 45 books from classes 1 to 6 of the fourth grade, and each class borrowed 48 books from classes 7 to 10. How many books have been borrowed from the library?
明光小学四年级开办"读书节"，各班向学校图书室借书，其中四年级1至6班每班借45本，7至10班每班借48本．图书室一共借出了多少本书？
<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">48 * 4</gadget>
<output>192</output>

<gadget id="calculator">270 + 192</gadget>
<output>462</output>

<result>462</result>