Duoduo bought a copy of "Grimm's Fairy Tales". This book has 180 pages in total, and I have read 60 pages. The rest she plans to read 6 pages a day, how many days will it take to finish it?
多多买了一本《格林童话》，这本书一共180页，已经看了60页．剩下的她计划每天看6页，还需要多少天才能看完？
<gadget id="calculator">180 - 60</gadget>
<output>120</output>

<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<result>20</result>