Xiao Lian planned to finish reading a 502-page storybook in 10 days, but actually only read 43 pages a day in the first 4 days. If you want to finish the book on time, how many pages will you read on average every day?
小莲计划用10天看完一本502页的故事书，实际上前4天平均每天只看43页．如果要按期把书看完，以后平均每天要看书几页？
<gadget id="calculator">43 * 4</gadget>
<output>172</output>

<gadget id="calculator">502 - 172</gadget>
<output>330</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">330 / 6</gadget>
<output>55</output>

<result>55</result>