A story book has 198 pages, and Li Ke read 108 pages in 6 days. According to this calculation, how many days are left to finish reading?
一本故事书有198页，李可6天看了108页，照这样计算，剩下的还要多少天才能看完？
<gadget id="calculator">198 - 108</gadget>
<output>90</output>

<gadget id="calculator">108 / 6</gadget>
<output>18</output>

<gadget id="calculator">90 / 18</gadget>
<output>5</output>

<result>5</result>