A story book has 285 pages, Jian Jian has already read 105 pages, and the rest needs to be read within 4 days. How many pages do you need to read on average every day?
一本故事书有285页，健健已经看了105页，剩下的要在4天内看完，平均每天要看多少页？
<gadget id="calculator">285 - 105</gadget>
<output>180</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<result>45</result>