Xiaofang reads a 450-page story book, and has already read 315 pages. The rest needs to be read within 5 days. How many pages do she read on average every day?
小芳看一本450页的故事书，已经看了315页，剩下的要在5天内看完，平均每天至少看多少页？
<gadget id="calculator">450 - 315</gadget>
<output>135</output>

<gadget id="calculator">135 / 5</gadget>
<output>27</output>

<result>27</result>