<p>The Friends of the library meet on the third Sunday of every month. What is the latest possible day of the month that this meeting could take place?
(A) The 20th
(B) The 21st
(C) The 22nd
(D) The 23rd
(E) The 24th</p>
<p>This problem was from the 2006 saturday PSAT, and I noticed a similar problem on a different PSAT. I tried sollving this problem, but I didn’t know how; I started recalling the days of each month and I then got completely lost. Is there an equation or mathematical approach to solve this question type or do you have to work based on knowledge about the calendar? Also, can someone give me a similar problem like this to solve so I know how to do this question for future PSAT exams?</p>