5. In a certain month, there are three Sundays that fall on even dates. What day of the week is the 5th of this month?
5. In the 28 days from the 1st to the 28th, there are four Sundays, two of which fall on prime dates, so there must be another Sunday on the 30th, which means the first Sunday is the 2nd, and the 5th is a Wednesday.