Guest answered :

As a wise guy might respond, the number of days in a month is not equal because they are different!? With that bad joke aside, we can uncover the true reason why the months on our common calendar have different numbers of days. We might also want to find out why the days are distributed among the 12 months the way they are.

The days of the month were not equal even during the period of the Roman Empire. In fact, the Roman calendar changed at least once, though it was based more directly on the changes of the moon. There are 29.5 days between new moons. This is the basis for the general length of months. One of the original Roman calendars had only 10 months and the months contained either 30 or 31 days. Curiously, there were more than 60 days of winter that didn’t seem to be included in a specific month.

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Guest answered :

I think you have not studied correctly in primary

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