Mum\textquotesingle s purse contains an equal number of £$$5$$, £$$10$$ and £$$20$$ notes, and no coins. The total value of money in her purse is £$$280$$. How many notes are in her wallet?  Answer~\uline{~~~~~~~~~~}~ 
Overseas Competition->Knowledge Point->Word Problem Modules->Equation Word Problems->Indefinite Equation Word Problems