There are~ $$30$$ students in Pat\textquotesingle s math class. If there are twice as many girls as boys in the class, how many boys are in the class? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Basic Computation of the Multiples
There are $$30$$ students in Pat\textquotesingle s math class. With twice as many girls as boys, the class has $$20$$ girls and $$10$$ boys. 