Eric baked $$255$$ chocolate cupcakes and cheese cupcakes. After selling away $$40 \%$$ of the chocolate cupcakes and $$75 \%$$ of the cheese cupcakes in the morning, he was left with an equal number of cheese cupcakes and choclate cupcakes How many cupcakes did Eric have left? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Proportions->Basic Units