Sarah had $$20$$ more Pokemon cards than Mark. Sarah bought $$16$$ extra Pokemon cards today, and she had $$3$$ times more Pokemon cards than Mark had. How many Pokemon card Sarah had before buying new cards today?~\uline{~~~~~~~~~~}~ 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Problems of Difference and Multiple->Differences and Multiples of Two Variables->Indirect Difference and Multiples of Two Variables