Kobayashi reads a book with a total of 360 pages, and he read 120 pages in the first 5 days. At this speed, how many days will it take to finish reading this book? (column proportional solution)
小林读一本书，全书共360页，前5天读了120页．照这样速度，读完这本书共用多少天？(列比例解)
<gadget id="calculator">5 * 360</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 120</gadget>
<output>15</output>

<result>15</result>