Tutu reads a 300-page story book, and after reading it for 6 days, there are still 60 pages left. How many pages does Tutu read on average every day?
图图看一本300页的故事书，看了6天后还剩60页，图图平均每天看多少页．
<gadget id="calculator">300 - 60</gadget>
<output>240</output>

<gadget id="calculator">240 / 6</gadget>
<output>40</output>

<result>40</result>