story book has 480 pages, and Li Hua read 120 pages in 3 days. According to this calculation, how many days will it take to finish reading the remaining books? (Solution with proportional knowledge)
一本故事书有480页，李华用3天看了120页．照这样计算，剩下的书还要几天看完？(用比例知识解)
<gadget id="calculator">480 - 120</gadget>
<output>360</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">360 / 40</gadget>
<output>9</output>

<result>9</result>