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There are several reasons not all simple.

A mixture of;

historical convention

the inability to measure the length of a year accurately

economic importance

combining different calendars

human vanity

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Q: Why do some months have 30 days and other months have 31 days?
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What months have 30 days in the them?

Apart from February, all months in the Gregorian calendar have 30 days: some have more.


Which 3 months have 30 days?

More than three months have 30 days in it. The months are April, June, August, and November. All other months (besides February) have 31 days in them.


How many moth of year have at lest 30 days?

11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.11 months of the year have at least 30 days.


How many days in 7 months?

It depends on the months that you include in the sequence. Remember that some months have 30 days, some have 31 days, and February has only 28 days.


What months have exactly 30 days?

April, June, September, and November have 30 days, other months have 31 days, except February which has 28 days or 29 days in a leap year.


Some months October for example have 31 days Only February except in a leap year has precisely 28 days How many months have 30 days?

11. The question is not specifically asking how many months have "exactly" 30 days. 11 months have "at least" 30 days. There are four months that do have exactly 30 days, and there are at least five different versions of this riddle.


Does 88 days equal 3 months?

That depends. If you add the days of February and two other months with 30 days, then yes. Otherwise, no.


How come some months have thirty one days and some thirty?

Seven months have 31 days while the remaining five have 30.


3 months equals how many days?

Depends on which 3 months you mean, some months have 30 days and some have 31, February has 28. So about 90.


How many months is 119 days?

Some months have 28 days (29 in a Leap Year), others have 30 or 31 days. The average is just less than 30½ days. 119 days is therefore about 2 days less than 4 months.


Some months have 31 days and some have 30 days how many have 29 days?

11 months have 29 days..........Only feb has 29 days in the leap year otherwise it has 28 days.


How many days are in nine months?

The average days in 9 months is 274 days. The exact answer to this question depends on the months in question, because some of the months may have 30 or 31 days or 28, or 29 days.