If 5th january 2001 was a friday the 25th december 2001 was a
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Monday is the answer
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1 St Jan and 365th day is 31st December
dividing 365 by 7 we see remainder is 1
Theory
if 1st Jan is Monday then 1+7 th is also Monday , similarly 1+14 is also Monday
so we observe that adding a no. 7n keeps the weekday same
and we have seen that 364 is a multiple of 7
so 1+52(7) will give same week day as 1st Jan , so 365th day or Dec 31st is same as 1st January and that is Amazing , I also didn't know that .
Now that we know this we can just backtrack it
5th was Friday then 1st Jan is Monday , wow In my example also it was Monday ,
so 31 St Dec is also Monday
So 25th Dec is Tuesday and that's the answer
dividing 365 by 7 we see remainder is 1
Theory
if 1st Jan is Monday then 1+7 th is also Monday , similarly 1+14 is also Monday
so we observe that adding a no. 7n keeps the weekday same
and we have seen that 364 is a multiple of 7
so 1+52(7) will give same week day as 1st Jan , so 365th day or Dec 31st is same as 1st January and that is Amazing , I also didn't know that .
Now that we know this we can just backtrack it
5th was Friday then 1st Jan is Monday , wow In my example also it was Monday ,
so 31 St Dec is also Monday
So 25th Dec is Tuesday and that's the answer
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