Xiao Ming went on a trip during the summer vacation and went there for 7 days. The sum of the dates of these 7 days plus the number of months equals 92. On what day of the month did he return home?

Suppose Xiao Ming goes out on day x, then the next day is day x+1, and so on, the seventh day is day x+6.

Available:

x+x+1+x+2+x+3+x+4+x+5+x+6=92

7x=92-21

Solution: x is approximately equal to 9

So Xiao Ming went out on the 9th.