The number of girls was $$\frac{9}{11}$$ of that of boys in the class. Now, $$2$$ girls are transferred in, the number of girls becomes $$\frac{10}{11}$$ of that of boys. How many students are there in the class now? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Finding the Base