14. (10 points) In a certain month, there are 3 Sundays that fall on even dates. What day of the week was the 1st of the month?
【Answer】Solution: Suppose the number of a Sunday in a certain month is even, then the next Sunday must be odd; and so on, if there are to be three Sundays with even numbers in a month, then this month must have 5 Sundays; the 1st of this month is a Saturday, otherwise it does not meet the requirements.

Therefore, the answer is: Saturday.