Xiaogang planned to read a 480-page book in 24 days, but actually read 12 pages more than the original plan every day. Based on this calculation, how many days can he finish reading the book?
小刚计划24天看一本480页的书，实际每天比原计划多看了12页，照这样计算，多少天可以看完这本书？
<gadget id="calculator">480 / 24</gadget>
<output>20</output>

<gadget id="calculator">20 + 12</gadget>
<output>32</output>

<gadget id="calculator">480 / 32</gadget>
<output>15</output>

<result>15</result>