If it was a Monday on 1 January 2018, what was the day of the week on 29 December 2018.

Saturday

The correct answer is Option (1) → Saturday

Quick calculation (2018 was not a leap year):

• 2018 had 365 days → 365 mod 7 = 1 (ordinary year advances the day of the week by 1)
• From 1 January to 31 December = exactly 364 days passed → 364 ÷ 7 = 52 weeks exactly → same day of the week
• Therefore, 29 December is 2 days before 31 December → 2 days before Monday = Saturday