其它
Alex, John and Sam went to buy oranges. Alex paid $\textbackslash$20$, John paid $\textbackslash$15$, and Sam only paid $\textbackslash$5$. They bought 120 oranges altogether. They divided them in proportion to the amount of money each of them had paid. How many oranges did John get? 
Overseas Competition->Knowledge Point->Word Problem Modules->Applying of Multiplication and Division
A: J: S  20:15:5 = 40  120/40 = 3 oranges per person  3*15= 45 oranges 