The elf reads a 360-page story book. He read 240 pages a few days ago, and he needs to finish reading the rest in 4 days. How many pages do he need to read on average every day?
小精灵读一本360页的故事书，前几天读了240页，剩下的要在4天内读完，平均每天要读多少页？
<gadget id="calculator">360 - 240</gadget>
<output>120</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<result>30</result>