Each letter represents a distinct number. Calculate the value of $$B$$.  $$C+B=18$$  $$B=A+A+A$$  $$C+A=10$$ 
Overseas Competition->Knowledge Point->Calculation Modules->Basic Concepts of Equation->Linear Equations with Multiple Variables Overseas Competition->Knowledge Point->Calculation Modules->Basic Concepts of Equation->Equivalent Substitution->Algebraic Expressions