book has 230 pages in total. I have already read 80 pages. I read the rest 6 pages a day on average. How many more days do I have to read?
一本书共230页，我已经看了80页，剩下的部分，平均每天看6页，还要看几天？
<gadget id="calculator">230 - 80</gadget>
<output>150</output>

<gadget id="calculator">150 / 6</gadget>
<output>25</output>

<result>25</result>