The ratio of Sally\textquotesingle s age to Gillian\textquotesingle s age is $$2 : 7$$. In $$15$$ years\textquotesingle{} time, the ratio of Sally\textquotesingle s age to Gillian\textquotesingle s age will become $$1 : 2$$. What is Sally\textquotesingle s age now?~\uline{~~~~~~~~~~}~years old. 
Overseas Competition->Knowledge Point->Word Problem Modules->Age Problems