Xiaohua has already read 60 pages of a 150-page storybook, and plans to finish the rest in 5 days. How many pages does she need to read on average every day?
一本150页的故事书，小华已经看了60页，剩下的打算用5天看完，平均每天要看多少页？
<gadget id="calculator">150 - 60</gadget>
<output>90</output>

<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<result>18</result>