Xiao Ming is going to read a 360-page book, and plans to finish it in 18 days, but actually read 5 pages less every day. How many days did he actually finish it?
小明准备读一本360页的数，计划18天读完，实际每天少读了5页，实际多少天读完？
<gadget id="calculator">360 / 18</gadget>
<output>20</output>

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">360 / 15</gadget>
<output>24</output>

<result>24</result>