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If Today Is Monday, What Day Will It Be in 100 Days?
If today is Monday, what day of the week will it be in exactly 100 days?
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What is the answer to the 'Monday plus 100 days' riddle?
Wednesday. Divide 100 by 7 to get a remainder of 2, so you move two days forward from Monday: Tuesday, then Wednesday.
How do you calculate the day of the week 100 days later?
Take the number of days, divide by 7, and keep the remainder. 100 / 7 leaves a remainder of 2, so count 2 days forward from your starting day.
Why does dividing by 7 work for this riddle?
The week repeats every 7 days, so every full block of 7 lands you back on the same weekday. Only the leftover remainder shifts the day.