A book has 215 pages, Xiao Fang has already read 68 pages, and plans to finish the rest in a week. How many pages does Xiao Fang read at least every day?
一本书有215页，小方已经看了68页，剩下的打算一周看完．小方每天至少要看多少页？
<gadget id="calculator">215 - 68</gadget>
<output>147</output>

<gadget id="calculator">147 / 7</gadget>
<output>21</output>

<result>21</result>