6. What day will it be 2021 hours after $20: 21$ on Monday?
A Friday
B Thursday
C Wednesday
D Tuesday
E Monday
Solution
D

First note that $2021=84 \times 24+5$. Therefore 2021 hours after $20: 21$ on a Monday is 84 days and 5 hours later. Since 84 days is equal to 12 weeks, this will be 5 hours after 20:21 on a Monday and hence is at $01: 21$ on a Tuesday.