A company credits salaries on the first Monday-to-Friday working day of each month. Using the January page shown, in how many months of that year is the salary credited on a Monday?

The first working day is a Monday when the month starts on Saturday, Sunday or Monday. 2031 (ordinary) month starts: Jan Wed, Feb Sat, Mar Sat, Apr Tue, May Thu, Jun Sun, Jul Tue, Aug Fri, Sep Mon, Oct Wed, Nov Sat, Dec Mon. So February, March, June, September, November and December: 6. (4 leaves out the two months that start on a Monday; 3 counts only the months that start on a Saturday.)