Obviously reading a 76-page book, I have been reading it for 3 days, and there are 16 pages left, how many pages are I reading on average every day?
明明看一本76页的书，已经看了3天，还剩16页没看，明明平均每天看多少页．
<gadget id="calculator">76 - 16</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>