The total mass of Xuanxuan and Lingling is $120.5\text{kg}$. The total mass of Xuanxuan and Jay is $105.25\text{kg}$. Lingling is twice as heavy as Jay. What is Xuanxuan\textquotesingle s mass?~\uline{~~~~~~~~~~}~$\text{kg}$ 
Overseas Competition->Knowledge Point->Calculation Modules->Negative Numbers