1 \ April 20081is Tuesday, with a period of 7 days, April 8 is Tuesday, then 7 days, April 15 is Tuesday, and the remaining 4 days, up to 4 days, and April 19 is Saturday.

If it is a row, it can be like this.

(19-1)/7 = April19 is a Saturday.

(30- 1)/7=4+ 1, and April 30th is Wednesday.

2. How many days did a * * * rest in April 2008? How many days have you been in class? How many Mondays to Fridays and how many weekends are there in April?

30/7=4 weeks and 2 days. Rest 4*2=8 days, class 4*5+2=22 days.