There are 760 comic books in the school library, of which 280 are lent out and 230 are returned. How many comic books are there in the library now?
学校图书室共有760本连环画，借出280本，还回230本．现在图书室有连环画多少本？
<gadget id="calculator">760 - 280</gadget>
<output>480</output>

<gadget id="calculator">480 + 230</gadget>
<output>710</output>

<result>710</result>