Xiao Ming reads a 500-page storybook, and read 150 pages in the first 3 days. According to this calculation, how many days will it take him to finish reading the storybook?
小明看一本500页的故事书，前3天看了150页，照这样计算，他看完这本故事书一共要多少天？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">500 / 50</gadget>
<output>10</output>

<result>10</result>