If tomorrow is friday, today is thursday.
A week has 7 days " Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday ".
24 / 7 = 3 ( Remainder = 3)
So you can say that after multiples of 7 days, the day will repeat itself as thursday.
Hence after 21 days thursday will occur again.
So we calculate after the remainder (3) , the answer is Sunday.
Simple Logic = And whatever the remainder obtained is, add that to the day.