30 students in class one of the third grade donated 390 books, including 54 new books, and the rest are old books. How many more old books than new ones?
三年级一班30名同学捐献图书390本，其中新书54本，剩下的是旧书，旧书比新书多多少本？
<gadget id="calculator">390 - 54 - 54</gadget>
<output>282</output>

<result>282</result>