Janice\textquotesingle s mother bought $$8$$ cartons of orange juice.  Each carton contained $$3$$ ℓ of orange juice.  Janice and her family drank $$9$$ ℓ of orange juice in a week.  How much orange juice was left in the carton after a week?  ~\uline{~~~~~~~~~~}~ℓ of orange juice was left in the carton after a week. 
Overseas Competition->Knowledge Point->Word Problem Modules->Unitary Method Problems->Finding the Total Value using Unitary Method