Xiaohua reads a 252-page storybook, and has already read 42 pages. After finishing the rest of the week, how many pages do she read every day on average?
小花看一夲252页的故事书，已经看了42页，剩下的一周看完，平均每天要看几页？
<gadget id="calculator">252 - 42</gadget>
<output>210</output>

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

<result>30</result>