A book has 420 pages, Xiaohong has already read 180 pages, and plans to finish the rest in 10 days. How many pages do the rest read on average per day?
一本书有420页，小红已经看了180页，剩下的打算10天看完．剩下的平均每天要看多少页？
<gadget id="calculator">420 - 180</gadget>
<output>240</output>

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

<result>24</result>