Xiaohong read a storybook with 558 pages in total, and read an average of 78 pages per day in the first 3 days. The rest of the plan is finished in 4 days. On average, how many pages does Xiaohong need to read every day?
小红看一本故事书共558页，前3天平均每天看了78页．剩下的计划4天看完，小红平均每天需要看几页？
<gadget id="calculator">78 * 3</gadget>
<output>234</output>

<gadget id="calculator">558 - 234</gadget>
<output>324</output>

<gadget id="calculator">324 / 4</gadget>
<output>81</output>

<result>81</result>