A book has 258 pages in total, Xiaogang has already read 142 pages, and the rest will be finished within 4 days. How many pages do you need to read on average every day?
一本书共258页，小刚已经看了142页，余下的要在4天内看完，平均每天要看多少页？
<gadget id="calculator">258 - 142</gadget>
<output>116</output>

<gadget id="calculator">116 / 4</gadget>
<output>29</output>

<result>29</result>