A box contained apples and pears. $$\frac{4}{5} $$ of the fruits were apples and the rest were pears. After $$\frac{3}{4} $$ of the fruits were removed, there were $$\frac{1}{8} $$ of the apples and $$30$$ pears left. How many fruits were there in the box at first? 
Overseas Competition->Knowledge Point->Counting Modules->Inclusion-Exclusion Principle