Xiao Ming plans to read a 240-page storybook in 12 days, but actually reads 4 more pages per day than planned. How many days did it take to actually read this book?
小明计划用12天看完一本240页的故事书，实际每天比计划多看4页．实际看完这本书用了多少天？
<gadget id="calculator">240 / 12</gadget>
<output>20</output>

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

<gadget id="calculator">240 / 24</gadget>
<output>10</output>

<result>10</result>