Xiao Ming reads an 84-page book. He reads an average of 11 pages a day in the first 4 days, and finishes it in the remaining 3 days. How many pages do he read in an average day this week?
小明看一本84页的书，前4天平均每天看11页，剩下的3天看完，这一星期平均每天看多少页？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">84 / 7</gadget>
<output>12</output>

<result>12</result>