My recipe for Chocolate Fridge Cake consists of $40\text{g}$~of chocolate and $100\text{g}$~of biscuits. If I only have~$75\text{g}$~of biscuits then how much melted chocolate will I have to use? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Basic Computation of the Multiples->Multiples of Multiple Variables Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Proportions