$$55\div7=7 \text{R}6$$. It is Saturday. 
My mom\textquotesingle s birthday is on Sunday, and my dad\textquotesingle s birthday is $$55$$ days after it. What day of the week will my dad\textquotesingle s birthday be? 
a: Sunday 
b: Monday 
c: Tuesday 
d: Thursday 
e: Saturday 