A jar with $5$~chocolates in it has mass $185\text{g}$ and the same jar with $17$ chocolates in it has mass $317\text{g}$. What is the mass of the jar with~$10$ chocolates in it?  Answer:~\uline{~~~~~~~~~~}~$\text{g}$ 
Overseas Competition->Knowledge Point->Calculation Modules->Basic Concepts of Equation->Equivalent Substitution->Writing down the Expression according to the Description 