7
There are 30+31+30+31 = 122 days in the last four months of the year.
212 days in a normal year and 213 days in a leap year.
31+31+30+31+30+31 = 184 days in total.
31+31+30+31+30+31 = 184 days in total.
2
There are 12 months per year. The amount of days per month is as follows: January has 31 days. February has 28 days in a normal year and 29 days in a leap year. March has 31 days. April has 30 days. May has 31 days. June has 30 days. July has 31 days. August has 31 days. September has 30 days. October has 31 days. November has 30 days. December has 31 days.
If by "only 31 days" you mean "exactly 31 days", then 7. If by "only 31 days" you mean "not more than 31 days" then all of them.
In the order they appear through the year, the months that have 31 days are:JanuaryMarchMayJulyAugustOctoberDecember
In a leap year, a day is added to February to keep the balance of the calendar making the year have 366 days in the year instead of 365. The number of days in all the other months stay the same which means that the months with 31 days stay the same. The months with 31 days are January, March, May, July, August, October, and December adding up to 7 months.
In the first 3 months of a leap year, there are 91 days. 31 + 29 + 31 = 91
It 31 days in this months