Hugo\textquotesingle s wallet contained some cash. He gave $$\frac{3}{7}$$ of his cash to his sister, and gave $$\frac{1}{8}$$ of his remaining cash to his mum. In the end, he had $ $280$ left in his wallet. How much money did he have at first? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Finding the Base