Answer
a. 52
b. 53
Work Step by Step
Divide 365 by 7 to get 52 with a remainder of 1.
Using this information you know there are 52 complete weeks, and then an additional day.
Since the year starts on a Monday, we know the additional day is a Monday, therefore there are 53 Mondays
Since there is only one additional day, and it is a Monday, we know there are only 52 Sundays.