When Zhang Hua reads a book, he reads 25 pages a day for the first 6 days, and then reads 5 more pages a day. After another 4 days, he just finishes reading it. How many pages does Zhang Hua read on average every day?
张华读一本书，前6天每天读25页，以后每天多读5页，又经过4天后，正好读完，张华平均每天读多少页？
<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">25 + 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">150 + 120</gadget>
<output>270</output>

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

<gadget id="calculator">270 / 10</gadget>
<output>27</output>

<result>27</result>