Ankit buys a 90-day gym pass that starts on the circled date (day 1). The gym is closed on Sundays. How many Sundays fall within his pass?

Day 90 is 89 days after Tuesday 15 January: 89 = 12 weeks + 5 days, so it is a Sunday (14 April). The pass covers 12 full weeks (84 days, 12 Sundays) plus 6 more days, Tuesday to Sunday, which add one more Sunday: 13. (12 forgets that the very last day is a Sunday.)