Given that March $$26$$\textsuperscript{th}, $$2021$$ was Friday, what day was April $$20$$\textsuperscript{th}, $$2021$$?  $\textasciitilde$ 
Overseas Competition->Knowledge Point->Word Problem Modules->Periodic Problems->Periodic Problems of Time
Counting from March $$26$$\textsuperscript{th}, $$2021$$, after $31-26=5$ days it was March $$31$$\textsuperscript{st}, $$2021$$. After $20$ days it was April $$20$$\textsuperscript{th}, $$2021$$. In total, there were $5+20=25$ days. $25\div 7 =3R4$, which means April $$20$$\textsuperscript{th}, $$2021$$ was Tuesday. 