book has 315 pages, Xiao Fang has already read 105 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315页，小方已经看了105页，剩下的打算一周看完．小方平均每天至少要看多少页？
<gadget id="calculator">315 - 105</gadget>
<output>210</output>

<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<result>30</result>