Question

What was the day of the week on 6 January 2010?

• A. Friday
• B. Thursday
• C. Wednesday
• D. Tuesday

Answer 1

Answer:

C. Wednesday

Solution:

No. of odd days	Ordinary year	Leap year
	365 ÷ 7 = 52 weeks + 1 odd day	366 ÷ 7 = 52 weeks + 2 odd day

And,

Years	No. of odd days
100	5
200	3
300	1
400	0

Note : Multiple of 400 years i.e 800, 1200, 1600, 2000 will also have 0 odds days.

Days	No. of odd days
Sunday	0
Monday	1
Tuesday	2
Wednesday	3
Thursday	4
Friday	5
Saturday	6

Now, calculating total number of odd days:

Total odd days till 6 January 2010 = 4 + 0 + 6 ⇒ 10 ÷ 7 = 3

Thus, "3" is the code for 'Wednesday'.

Hence, "Wednesday" is the correct answer.