Zhang Hua read a 540-page storybook and read 45 pages in 3 days. At this speed, how many days will it take to finish reading this storybook?
张华读一本540页的故事书，3天读了45页．照这样的速度，一共需要多少天读完这本故事书？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">540 / 15</gadget>
<output>36</output>

<result>36</result>