A story book has 550 pages, Xiao Liang has already read 220 pages, and the rest reads 30 pages a day, how many days can he finish it?
一本故事书有550页，小亮已经看了220页，剩下的每天看30页，几天可以看完？
<gadget id="calculator">550 - 220</gadget>
<output>330</output>

<gadget id="calculator">330 / 30</gadget>
<output>11</output>

<result>11</result>