A book of "Fairy Tale World" has 180 pages in total, and Xiaoya read 36 pages in the first 3 days, so how many days will it take to finish this book?
一本《童话世界》共180页，小雅前3天看了36页，照这样计算看完这本书还要几天？
<gadget id="calculator">180 - 36</gadget>
<output>144</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<result>12</result>