story book has 270 pages. Xiao Ming read 72 pages in the first 4 days. According to this calculation, how many days will it take to finish the remaining pages? (Solution with proportional knowledge)
一本故事书有270页，小明前4天看了72页书，照这样计算，剩下的页数还需要几天看完？(用比例知识解)
<gadget id="calculator">270 - 72</gadget>
<output>198</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">198 / 18</gadget>
<output>11</output>

<result>11</result>