There are five Sundays in a month, and the dates of three of them are even. The dates of two Sundays are odd. Which days of the month are Sundays?

There are five Sundays in a month, and the dates of three of them are even. The dates of two Sundays are odd. Which days of the month are Sundays?

Because there are seven odd days in a week, the dates of Sundays in the same month must be odd and even
So the first Sunday is the 2nd, followed by 9, 16, 23 and 30
In addition, if the first Sunday is the 4th, it can be concluded that the fifth Sunday is the 32nd, so 2 / 9 / 16 / 23 / 30 is the only solution

There are five Sundays in a month. The dates of three Sundays are even and the dates of two Sundays are odd. Which days of the month are Sundays?

4 * 7 + 1, so this month at least 29 days
I know 31 days at most
If the 1st is Sunday, there are three odd numbers and the last one is 29
If the 2nd is Sunday, there are two odd numbers and the last one is 30
If the 3rd is Sunday, there are three odd numbers and the last one is 31
So: 29 16 23 30

If there are even dates on three Sundays in a month, what day is the 1st of this month?

Saturday

There are even dates of three Sundays in a month. Please calculate that the first day of this month is a week______ ．

Because the dates of three Sundays in a month are even, there must be five Sundays in this month, seven days in a week. The difference between the first Sunday and the last Sunday is 28 days, and the dates of Sundays are even, so: the first Sunday is the 2nd, and the last Sunday is the 30th; so the 1st of this month is Saturday

A Q B: today is Friday and another 30 days is Sunday___ If the 16th is Monday, the 31st of this month is a week___ ．

（1）30÷7=4… 2. Today is Friday, and the next two days are Sunday. (2) 31-16 = 15, 15 △ 7 = 2 The 16th is Monday, and the 31st is Tuesday

There are three weeks in September of a certain year. The date of 6 is singular. What day is the last day of this month?

Adjacent Saturdays are odd and even mutually exclusive. Therefore, if the date of three Saturdays is singular, there must be five Saturdays in this month: 1, the first Saturday; 2, the third Saturday; 3, the fifth Saturday (that is, the last Saturday)
The month may be 30 days or 31 days (February is impossible, because February days are too few). So the last day is Saturday or Monday

Friday, September 1st, 2006. What day is Friday, October 1st, 2006? New Year's day, 2007,

Methods and steps:
1. First calculate the number of days between the start and end time
2. Divide the number of days by 7. Add the rest to the original day of the week
3. The remainder plus the original day of the week, and greater than 7, to subtract 7
4. The result calculated according to the above steps is the day of the week
1. September is small, only 30 days, so from September 1, 2006 to October 1, 2006, a total of 30 days
2、30÷7=4.2
3. 2 + 5 = 7 (5 is the number of weeks on September 1)
So October 1, 2006 is Sunday
There are 30 days in September, 31 days in October, 30 days in November and 31 days in December, so from September 1, 2006 to new year's day, 2007
There are 122 days, 122 + 7 = 17.3, 3 + 5 = 8, 8-7 = 1, so new year's day in 2007 is Monday

2009 is January 1st, and Thursday is the day of children's day.
If you want the formula,

31 + 28 + 31 + 30 + 31 = 151 Tian 151 / 7 = 21 more than 4 days, Thursday plus 4 days, is Monday

The children's Day is Monday. What day is June 19th?

Thursday

June 1st, 2007 is Friday. What day is October 1st, 2007?
How to use the formula to calculate this problem!
Primary school mathematics problems

(30 + 31 + 31 + 30) / 7 = 17.3 (days)
So three days from Friday should be Monday