Fatty planned to read a 600-page storybook in 30 days, but he actually finished it in 25 days. How many more pages do you actually read each day than planned?
小胖计划30天看完一本600页的故事书，实际他25天就看完了．实际每天比计划多看多少页？
<gadget id="calculator">600 / 25</gadget>
<output>24</output>

<gadget id="calculator">600 / 30</gadget>
<output>20</output>

<gadget id="calculator">24 - 20</gadget>
<output>4</output>

<result>4</result>