If today is Monday and you add 45 days, what day will it be?

If today is Monday and you add 45 days, what day will it be?

• A. Thursday
• B. Friday
• C. Saturday
• D. Sunday

Answer: (A)

Days of the week repeat every seven days, so add 45 days by using 45 modulo 7. That leaves 3 days (since 45 − 42 = 3). Starting from Monday, three days forward is Monday → Tuesday → Wednesday → Thursday. Six full weeks bring you back to Monday, then three more days lands on Thursday.

Days of the week repeat every seven days, so add 45 days by using 45 modulo 7. That leaves 3 days (since 45 − 42 = 3). Starting from Monday, three days forward is Monday → Tuesday → Wednesday → Thursday. Six full weeks bring you back to Monday, then three more days lands on Thursday.