Multiple choice general knowledge math & puzzles Some months have 31 days; how many have 28? 1 2 6 12 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Every month of the year has at least 28 days - February has 28 or 29 days, while the other months have 30 or 31. The trick is recognizing that 'having 28 days' doesn't mean 'having only 28 days' - all months satisfy this condition.