Li Hong read a book. He read an average of 25 pages a day in the first 6 days, and a total of 60 pages in the last 4 days. How many pages does he read per day on average?
李宏同学读一本书，前6天平均每天读25页，后4天共读了60页．他平均每天读多少页？
<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">150 + 60</gadget>
<output>210</output>

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

<gadget id="calculator">210 / 10</gadget>
<output>21</output>

<result>21</result>