Yasmin had $$210\rm kg$$ of grapes. She sold $$\frac37$$ of the grapes on Monday and $$\frac38$$ of the remainder on Tuesday.~ She packed the remaining into small bag containing $$\frac34\rm kg$$ of grapes.~ How many small bags of grapes did Yasmin pack? 
Overseas Competition->Knowledge Point->Counting Modules->Inclusion-Exclusion Principle