Teacher Xiao Wang went out for a meeting and did not return to the dormitory for 7 days. When he came back, he tore off the 7 calendars and found that the sum of the 7 dates was 119. So, what is the date when Mr. Wang returns home?
小王老师外出开会，7天没有回宿舍，回来后一次撕下这7张日历，发现这7张日期数相加得119，那么，王老师回家这天是多少号．
<gadget id="calculator">119 / 7</gadget>
<output>17</output>

<gadget id="calculator">17 + 3 + 1</gadget>
<output>21</output>

<result>21</result>