If Today Is Wednesday, what was the day before 20 days

How do we solve it ?

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

20 / 7 = 2 ( Remainder = 6)

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

Hence before 14 days Wednesday would occur again.

So we calculate before the remainder (6) , the answer is Thursday.

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