If Today Is Thursday, what was the day before 39 days

If today is thursday,what was the date before 39 days ago ?
Sunday

How do we solve it ?

A week has 7 days " Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday ".

39 / 7 = 5 ( Remainder = 4)

So you can say that before multiples of 7 days, the day will repeat itself as thursday.

Hence before 35 days Thursday would occur again.

So we calculate before the remainder (4) , the answer is Sunday.

Simple Logic = And whatever the remainder obtained is, deduct that to the day.

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