Lemony Snickett's Snack Shack is open every day except Sundays and Mondays. How many days is it open per week?

• A. Four days
• B. Six days
• C. Five days
• D. Seven days

Answer: (C)

You count how many days are available by removing the days it’s closed from the total days in a week. A week has 7 days, and if it’s closed on Sundays and Mondays, that’s 2 days closed. So open days = 7 − 2 = 5. The snack shack would be open on Tuesday, Wednesday, Thursday, Friday, and Saturday. The other options would imply different closing patterns (four days would mean three days closed; six days would mean only one day closed; seven days would mean open all week).