The school library originally had 800 books, and 247 books were borrowed in the morning. 258 books were borrowed in the afternoon, how many books are there in the library now? (answer in two ways)
学校图书馆原有图书800本，上午借走247本．下午借走258本，现在图书馆有图书多少本？(用两种方法解答)
<gadget id="calculator">800 - 247 - 258</gadget>
<output>295</output>

<result>295</result>