Traditional Culture Encyclopedia - Tourist attractions - Xiaoming took advantage of his summer vacation to travel. Xiao Ming said, "I went out for a week, and these seven dates add up to 84." Guess what date I went out.

Xiaoming took advantage of his summer vacation to travel. Xiao Ming said, "I went out for a week, and these seven dates add up to 84." Guess what date I went out.

Let Xiao Ming go out on X, then the next day is x+ 1, and the seventh day is x+6.

Available:

x+x+ 1+x+2+x+3+x+4+x+5+x+6 = 84

7x=84-2 1

Solution: x=9

So Xiaoming went out on the 9th.