Li Ming has read a 398-page storybook for 3 days, 50 pages a day, and finished it in the remaining 4 days, how many pages on average?
李明看一本398页故事书，已经看了3天，每天看50页，剩下的4天看完，平均看多少页？
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">398 - 150</gadget>
<output>248</output>

<gadget id="calculator">248 / 4</gadget>
<output>62</output>

<result>62</result>