Name the months with exactly 31 days.

http://www.calendardate.com/2008.php

Jan, Mar May JULY August Oct, Dec

how many gallon of gas are in the barrel?

To determine the months with exactly 31 days, we can use some basic knowledge about the Gregorian calendar. Here's how you can find the answer:

1. Start with the month of January, which has 31 days.
2. Count forward using the pattern of the lengths of the months. Remember that some months have 30 days, while others have 31 (except for February).
3. Continue counting until you reach the end of the year.
4. The months with exactly 31 days are: January, March, May, July, August, October, and December.

So, the answer to your question is: January, March, May, July, August, October, and December have exactly 31 days.