Pip and Bud each have some pocket money. Pip has ￡$50$ more than Bud. When Pip has spent $80 \%$ of his pocket money and Bud has spent $\frac34$ of her pocket money, the ratio of Pip\textquotesingle s leftover pocket money to that of Bud is $6:5$. How much pocket money did Pip have to begin with? 
Overseas Competition->Knowledge Point->Calculation Modules->Ratios and Proportions