Reading a 260-page story book, I have already read 105 pages, and finished reading the remaining 5 days, how many pages are read per day on average.
看一本260页的故事书，已经看了105页，剩下的5天看完，平均每天看多少页．
<gadget id="calculator">260 - 105</gadget>
<output>155</output>

<gadget id="calculator">155 / 5</gadget>
<output>31</output>

<result>31</result>