What day are July 1st, Wednesday and August 8th, 2009? Detailed process

What day are July 1st, Wednesday and August 8th, 2009? Detailed process

This should be calculated in this way. You can explain it to your baby in this way
There are 5 steps
1、 July is 31 days
2、 Seven days a week
3、 July 1 to August 8 (interval days) 31 + 8-1 = 38 days
4、 38 / 7 = 5, the remainder is 3 days
5、 Wednesday + 3 equals Saturday
That's all

The national day of a certain year is Wednesday, so the last day of this month is Sunday______ ．

31-1 = 30 (days), 30 △ 7 = 4 (weeks) If the national day of a certain year is Wednesday, then the last day of this month is Friday