Xiao Ming reads a story book. He reads 25 pages a day for the first 4 days, and then reads 20 more pages a day. After another 6 days, he finishes reading. How many pages does Xiao Ming read on average every day?
小明读一本故事书，前4天每天读25页，以后每天多读20页，又经过6天全读完了，小明平均每天读多少页？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">20 + 25</gadget>
<output>45</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">100 + 270</gadget>
<output>370</output>

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

<gadget id="calculator">370 / 10</gadget>
<output>37</output>

<result>37</result>