At first, in the canteen, $40 \%$ of the students were boys. After $16$ boys left and $16$ girls entered the canteen, the boys made up $\frac{2}{15}$ of the students in the canteen. How many girls are in the canteen now?~\uline{~~~~~~~~~~}~girls. 
Overseas Competition->Knowledge Point->Word Problem Modules->Equation Word Problems->Word Problems for Linear Equations with One Variable