When Wang Fang read a book, she read 27 pages on the first day, and a total of 63 pages in the next two days. How many pages did she read on average in these three days?
王芳看一本书，第一天看了27页，后两天一共看了63页，这三天平均每天看书多少页．
<gadget id="calculator">27 + 63</gadget>
<output>90</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<result>30</result>